Like many 5e players, I investigated other systems during the drama in January. I have converted my table over to Pathfinder 2e, so that's what I'll mostly be running going forward.
However, I'm not one of those people who thinks 2e is better than 5e in all respects, and I'll probably run 5e again at some point in the future. And when I do, there's a mechanic from Pathfinder that I will 100% be porting over to 5e: Hero Points.
Below I will provide a version of this mechanic, written in the mechanical language of 5e (to the best of my ability)
Hero Points
(replaces inspiration)
Hero points represent a player character's unique ability to act heroically against adversity.
At the beginning of each play session, each player loses any hero points they have accumulated, then recieves 1 hero point. Depending on the average duration of your group's gaming sessions, the DM may increase or decrease the frequency of this by periodically resetting hero points mid-session, or only once every couple sessions. The expectation is that this reset will occur roughly once every 3-5 hours of play.
The DM may award additional hero points for any reason. They are encouraged to give out hero points to reward good roleplaying, good tactics, or any behaviour which improves the play experience for everyone at the table. A DM should award an average of approximately one hero point for every hour of play. You can have multiple hero points, but you can never have more than 3 hero points.
Whenever you roll an attack roll, saving throw, or ability check, you may spend a hero point after seeing the result and after the DM tells you whether or not the roll was a success or failure. If you do, you reroll the check and must use the new result, even if it is worse. This roll is unaffected by whether you have advantage or disadvantage on the check.
Whenever you would fall unconscious due to being reduced to 0 HP, or whenever you would accumulate a death saving throw failure, you may spend all of your hero points in order to remove any death saving throw failures and become stabilized at 0 HP.
The DM may provide other options for how to spend hero points, such as altering the story or introducing new information which benefits the party.
That's it, that's the whole mechanic. In general I just think 2e does a much better job of the "inspiration" system than 5e.
In my years as both a player and a DM, I can count on one hand the number of times I ever saw Inspiration being awarded to 5e players. It simply isn't a good system. The DM fiat needed to receive it makes it unpredictable, and it's way too hard to get players to actually spend it once they have it.
The Hero Points system is much better because it resets every session, meaning that players will have a predictable way to get hero points, and that they will have a good reason to spend them; even if the DM forgets to award it. And since they will be spending that resource more often, the DM will have more reminders that the mechanic exists.
I encourage DMs out there to experiment with this system in their own games. And let me know how it goes.
While this is all well and good, I think the OneD&D playtest provided a great fix on the biggest issue I've had with the mechanic: Remembering it exists.
Simply stating that on an unmodified 20 or 1 that Inspiration is granted is a fantastic way to remind the GM that they should give this out more often. It's gotten to the point that in cases where I would have previously given ad-hoc advantage, I now give inspiration where the player can make use of it if they feel like they want or not.
Also I have adopted those rules for both hero points in PF2e, and my regular D&D5e game. I mean both of them.
How it works....
A player rolls a Natural 1 - They get inspiration to use on a future roll. A player rolls a Natural 20 - They choose another player at the table who gets inspiration.
These two together more or less ensures that there's an amount of inspiration floating around all the time. But this also solves an issue where a hot-streak gets hotter, and someone with luck early on will get more of a spotlight later. By making success something that gives a boon to someone else, you build espirt de corps as everyone celebrates eachothers' successes more, and the spotlight be more likely to move to another player.
As I said before, this system works fantastic in both Pathfinder and D&D. The only downside is that it feels like PCs have an extra layer of plot armor, but that is mitigated by the fact that it wasn't my decision that I made capriciously. Also it makes math rocks a little more 'WEEE'!
You're right about the real issue being that people just don't use the system, whatever you're calling it. I just started a campaign with a new group and the DM has his own variation on it that is really just a minor tweak...except that he appears to not forget that it exists. His tweak is making inspiration a collective (and cumulative) pool for the entire party and "you guys keep track of it, I have enough things to juggle already with seven players and all the NPCs, monsters, plot, description, etc." In our only session so far he gave us two points, one I think for roleplay and the other because I posted a muscle wizard meme image in the discord while he was struggling to properly describe the second phase of the bulked up wizard boss we were fighting ("Yeah, like that! Take a point of inspiration!"). We didn't actually use any of it yet but with the fight we ended on a cliffhanger for I'm planning to be proactive if nobody else does.