Is this still a legitimate concern? In another lifetime I’ve been working on phones and ’ve been flashing them multiple times a day, despite that, storage worked fine years later. I feel like the argument is a bit of a cargo culting.
Sure, there is
/var/lock and pid files which make a lot of sense in ram (they are often just a few bytes), but, as I’ve hinted above,
/var/log would be better on persistent storage.