Oddly enough I find senior engineers at my company demand ridiculous comments like this oddly enough. I've found that a 1:3 comment:code ratio (basically a comment every 2-3 lines with a new line separating each block) is the only thing that will prevent some annoying code review comments asking for clarifications.
Agreed, it’s one of those things that works well if it happens organically but not as a policy. I’ve got a personal wiki at work where I dump a bunch of useful stuff, it has helped people and attracted attention which is nice. I think the easiest solution is to have longer-form team meetings once a week.