Sync the drive cache with the disk.

That assumes dev resources are limitless. And for a company the size of proton that’s certainly not true.

They can only have X amount of devs. So how they allocate them says a lot.

Also given that most complaints I’ve seen at the top are about specific missing features for ages, I think it’s safe they’re putting their eggs into too many baskets.

That assumes you don’t value your time spent dealing with troubles that come.

Like the other person said, it’s fine if you don’t, but for me it’s worth a little upfront cost to have to deal with less ordering new drives, putting the drive in the server, monitor rebuilding of the array, ect…

None of that is an excuse for lack of proper backups. Because even new drives can fail catastrophically.