Nope. You always need end-to-end parity integrity checking. Your data goes through too many layers before reaching the storage medium. E.g. I once got a substantial amount of my pictures filled with bit errors because of a faulty RAM module in my NAS.
This happened to me, and caused me to rethink my approach file management.
Unfortunately, mainstream tooling is largely fire-and-forget and never includes verification (e.g. copying succeeds even if the written data is getting garbled), so one is forced to use multi-step workflows to get around this. It's pretty discouraging that no strong abstractions exist in this space.
Yes, end-to-end checking is a must - but that applies to any method of integrity protection. I could run TrueNAS at home on some old desktop I've retired instead of the used Dell R520 I bought for the task, but I have experienced memory failures before and expect them to happen - this doesn't change if you're using .par files instead.
(People underestimate how frequently memory corruption can actually occur, almost two years ago when Overwatch first came out the game kept crashing - it took me forever to find the cause was a faulty DIMM. Hell, right now the R320 I have in my rack at home has an error indicator because one of my 2 year old Crucial RDIMM's has an excessive amount of correctable errors).
