Ok, now imagine a concentrated holding by founder of something like WeWork, or a fallen giant of yesteryear (especially wrt inflation / opportunity cost by comp

Ok, now imagine a concentrated holding by founder of something like WeWork, or a fallen giant of yesteryear (especially wrt inflation / opportunity cost by comparison to some broad index). For every formerly concentrated investor who would've done well to stay concentrated, there's tonnes who did and shouldn't have, or didn't and would've suffered if they had.