Shadowrun 5e is my gold standard for a crunchy game

The funniest thing is that outside chargen, which can be tool assisted with chummer 5, Shadowrun 5e is best played as like a pretty light narrative game where you just use the numbers chummer gives you. Like it has a ton of rules and tables and all but like 99% of your actions are just "do a skill check, here's a special name for it" and 99% of the modifier tables are "little contextual problem -1; normal contextual problem -2; big contextual problem -3; extreme contextual problem -4" so you can confidently wing it in a very smooth way. The only people who really need to know all the crunchy bullshit parts are the decker and GM, and even that can be streamlined if the decker actually knows what they're doing and how to minimize their rolls correctly. Even the mage doesn't need to know more than just how their own spells work, because the astral is useless in the extreme (what's there? nothing. What can you use it for? vague context-free, detail-free reconnaissance better done with a drone. What can you affect from it? literally nothing) so its rules can just be ignored completely.