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This doesn't make sense. SSD controllers have been able to handle any write amplification under any load since SandForce 2.
Also most of the argument around speed doesn't make sense other than DC-grade SSDs being expected to be faster in sustained random loads. But we know how fast consumer SSDs are. We know their sequential and random performance, including sustained performance - under constant load. There are plenty benchmarks out there for most popular models. They'll be as fast as those benchmarks on average. If that's enough for the person's use case, it's enough. And they'll handle as many TB of writes as advertised and the amount of writes can be monitored through SMART.
And why would ZFS be any different than any other similar FS/storage system in regards to random writes? I'm not aware of ZFS generating more IO than needed. If that were the case, it would manifest in lower performance compared to other similar systems. When in fact ZFS is often faster. I think SSD performance characteristics are independent from ZFS.
Also OP is talking about HDDs, so not even sure where the ZFS on SSDs discussion is coming from.
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.
Are you saying SSDs are faster than HDDs?
I was asking them to post their setup so I can evaluate their experience with regards to Proxmox and disk usage.