SSD capacity for sample library

I’ve read that SSD’s should only get filled to 75-85% (varies by source) of their capacity because after that they slow down. All of the explanations (which do make sense) refer to degradation of the write speed. But since a sample library only really depends on read performance it seems like it shouldn’t be a problem to fill it almost all the way up. Am I missing something here?

Most modern SSDs have over-provisioning which essentially means a spare 10-15% capacity to replace failed cells without the user even noticing. You should not see a significant performance drop-off just because the disk is nearly full - although some SSDs do slow down over time - regardless of how full they are - certain age Samsung 840s are known for it.