Again you're mistaking my point. I know enough to know what I don't know and the risk involved in doing any serious crypto work, that I can't solo build librari

Again you're mistaking my point. I know enough to know what I don't know and the risk involved in doing any serious crypto work, that I can't solo build libraries to protect financial transactions or whatever willy-nilly. It's obviously a ton of work to get right. What I'd advocate for instead of "never roll your own crypto" is more like "never use your own crypto in prod". People are better off knowing more than less and getting their hands a little dirty. I think the former, common message is more like "don't even try to understand it," which is a joke.