You really should dive into GURPS. Chris Normand has a good YouTube series in the basics, but the gist is that it’s both the simplest and most intricate system out there. Basically everything is a 3d6 skill check, but there are thousands of pages dedicated to figuring out exactly what modifiers apply. The modularity is delightful, basically every rule is entirely and explicitly optional
You really should dive into GURPS. Chris Normand has a good YouTube series in the basics, but the gist is that it’s both the simplest and most intricate system out there. Basically everything is a 3d6 skill check, but there are thousands of pages dedicated to figuring out exactly what modifiers apply. The modularity is delightful, basically every rule is entirely and explicitly optional