@gloriouscow I didn't say yearly. It takes a whole heck of a lot longer than a year... That's my point. I forget how often you need to do it, but it's crazy high. Like five years to be super safe, probably 10+ to be realistic.
A couple of months ago I dug a MP3 player out that I last used in something like 2012, just before I switched to a smartphone instead. The old full sized SD flash card in it still was 100% readable with zero errors as was the internal flash (including its firmware of course.)
(As a side note, fun fact, but somehow the battery wasn't wrecked despite being below a safe voltage for who knows how many years... It's probably like 60% of what it once was, but it still holds a decent charge. Not bad for a player I bought in something like 2008...)