I know that every time I have to use it (which isn't very often) I have to look up WTF each switch does in the manual because there's no way I'll ever remember what "hard", "soft", and "mixed" are supposed to mean.
In https://git-scm.com/blog, scroll down to "The Role of Reset" - it's always helped me remember how reset moves up the various tree roles.
I will say, I personally rarely use --soft, it's either the default --mixed, or --hard in a more 'severe' case, so it's a bit easier for me to remember the roles and the relation to the flags.
Well I know lots of great developers who haven't used git (but have been using version control systems for 30 years), so using a particular command of a single version control system as a qualification for whether someone can architect something is inane.
Nothing other than it is totally irrelevant to architecture