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Since it’s kind of related, here’s my anecdote/data point on the bit rot topic: I did a 'btrfs scrub' (checksum) on my two 8 TB Samsung 870 QVO drives. One of them has been always on (10k hours), while the other hasn’t been powered on a single time in 9 months and once in 16 months.

No issues were found on either of them.

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How much have been written to each of them across their lifetime?

very little, about 25 TB written on the always-on one. The offline one just does diffs, so probably <12 TB. Both are kind of data dumps, which is outside their designed use case. That's why I included data integrity checks in my backup script before the actual rsync backup runs. But again no issues so far

if only i could trust btrfs scrub

What can’t you? I’m curious, as I somewhat rely on it.

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