When I was first getting into programming and computer science as a student, I was so into these kinds of super-customizable rabbit holes. My whole life pretty much centered around the keyboard and terminal. I was all in on knowing everything about the entire stack and making it do whatever it was I wanted. I'd spend hours to save a few keystrokes. That wasn't so much about the productivity trade-off as it was about…
In no way do I want to come off as rude with this comment, but to me what you are saying is not at all different from "when I was young I used to work out and eat healthy... a couple of decades later, I just fund it all so exhausting". Customizing your computer environment is good. Eating healthy is good. None of those need to end up in a "rabbit hole". Everyone can be tired of life and give up due to exhaustion, but…
a) learning Spanish to talk to that hot chick/dude
b) traveling around the world
c) doing whatever else you love to do besides coding