This discussion has been around as long as memory cards of any sort, I bet. The most persuasive argument I’ve ever heard for formatting hsa to deal with the file system.
Deleting individual clips (even deleting all) doesn’t write a new table of contents for the drive. If there was any sort of corruption it will not be fixed. I read a post long ago which speculated that deleting may cause data to be written to the card in haphazard fashion, replacing chunks of memory relating to when they were deleted. I think the reason was that a new FAT would see the whole card as one available space, while a FAT of a card with a ton of deletions would have many available chunks.
I quit caring about how disk operating systems work back in the 80s, so I don’t claim any sort of technical expertise here. I’m just passing along what I’ve read.
Cf