I think you've misunderstood my complaint. I know how you go about composing things in a Unix shell. Within your post, you've mentioned several distinct languages:

sh (I don't see any Bash-specific extensions here)
Perl-compatible regular expressions, via grep -P
printf expressions
GNU ps's format expressions
awk

That's quite a lot of languages for such a simple task, and there's nothing forcing any consistency between them. Indeed, awk specifically avoids being like sh because it wants to be good at the things you use awk for. I don't personally consider something to be doing its job well if it's going to be wildly different from the things it's supposed to be used with, though (which is where the disagreement comes from - the people designing Unix thought of it as a benefit). It's important to remember that the people designing Unix were very clever and were designing it for other very clever people, but also under conditions where if they hit a confusing awk script, they could just yell Brian, and have the inventor of awk walk over to their desk and explain it. On the other hand, it's a lot of stuff for a regular person to have in their head at once, and it's not particularly easy to discover or learn about in the first place, especially if you're just reading a script someone else has written that uses utilities you've not encountered before. If a general-purpose programming language had completely different conventions in different parts of its standard library, it'd be rightly criticised for it, and the Unix shell experience isn't a completely un-analogous entity.

So, I wouldn't consider the various tools you used that don't behave like the other tools you used to be doing their job well, as I'd say that's a reasonable requirement for something to be doing its job well.

On the other hand, PowerShell can do all of this without needing to call into any external tools while using a single language designed to be consistent with itself. You've actually managed to land on what I'd consider a pretty bad case for PowerShell as instead of using an obvious command like Get-ComputerInfo, you need:

(Get-WmiObject Win32_ComputerSystem).FreePhysicalMemory / 1024

Even so, you can tell at a glance that it's getting the computer system, accessing it's free physical memory, and dividing the number by 1024.

To get the process ID with the largest working set, you'd use something like

(Get-Process | Sort-Object WorkingSet | Select-Object -Last 1).Id
# or
(Get-Process | Sort-Object WorkingSet)[-1].Id

I'm assuming either your ps is different to mine, or you've got a typo, as mine gives the parent process ID as the second column, not the process' own ID, which is a good demonstration of the benefits of structured data in a shell - you don't need sed/awk/grep incantations to extract the data you need, and don't need to learn the right output flag for each program to get JSON output and pipe it to jq.

There's not a PowerShell builtin that does the same job as watch, but it's not a standard POSIX tool, so I'm not going to consider it cheating if I don't bother implementing it for this post.

So overall, there's still the same concept of composing something to do a specific task out of parts, and the way you need to think about it isn't wildly different, but:

PowerShell sees its jurisdiction as being much larger than Bash does, so a lot of ancillary tools are unnecessary as they're part of the one thing it aims to do well.
Because PowerShell is one thing, it's got a pretty consistent design between different functions, so each one's better at its job as you don't need to know as much about it the first time you see it in order to make it work.
The verbosity of naming means you can understand what something is at first glace, and can discover it easily if you need it but don't know what it's called - Select-String does what it says on the tin. grep only does what it says on the tin if you already know it's global regular expression print.
Structured data is easier to move between commands and extract information from.

Specifically regarding the Unix philosophy, it's really just the first two bullet points that are relevant - a different definition of thing is used, and consistency is a part of doing a job well.