I think that's a misprint. Looks like two of the ports are 3 and two of them are 2.
Yeah running it and it actually being useful are two very different things.
I was asking them to post their setup so I can evaluate their experience with regards to Proxmox and disk usage.
There is no way to get acceptable IOPS out of HDDs within Proxmox. Your IO delay will be insane. You could at best stripe a ton of HDDs but even then one enterprise grade SSD will smoke it as far as performance goes. Post screenshots of your current Proxmox HDD/SSD disk setup with your ZFS pool, services, and IO delay and then we can talk. The difference that enterprise gives you is night and day.
Yes you don't need Proxmox for what you're doing.
ZFS absolutely does not require them in any way.
Who said it does? Also regarding Proxmox:
https://forum.proxmox.com/threads/consumer-grade-ssds.141190/post-632197
Looking back at your original post, why are you using Proxmox to begin with for NAS storage??
For ZFS what you want is PLP and high DWPD/TBW. This is what Enterprise SSDs provide. Everything you've mentioned so far points to you not needing ZFS so there's nothing to worry about.
Yes I'm specifically referring to your ZFS pool containing your VMs/LXCs. Enterprise SSDs for that. Get them on ebay. Just do a search on the Proxmox forums for enterprise vs consumer SSD to see the problem with consumer hardware for ZFS. For Proxmox itself you want something like an NVME with DRAM, specifically underprovisioned for an unused space buffer for the drive controller to use for wear leveling.
Yeah there's conflicting info, under USB it says "2USB3.0；2USB2.0"