Started doing exactly that a few years back when my own project was getting out of hand. I literally made a new folder called “core” and moved over the 10 or so functions that got called every single day, then shoved everything else into a “vault” folder no new dev even needed to peek at unless they got curious. Ended up trimming about 40% of the codebase once I actually looked at usage stats and saw stuff I wrote drunk at 2am never got touched. Made a mental note to kill any feature that didn't hit 5% usage over a couple months, and onboarding went from a two day nightmare to a quick afternoon chat.

Exactly, it's the difference between fixing it once and fixing it every single time. Auto layout turns spacing into a rule instead of a guess. Once you set it, you can forget it.