I purged a lot almost 4 years ago when I moved and managed to get my CRB print books down to 5 (D&D5e, SWADE, FATE, Mythras, CoC 7) . I reduced my printed splat and companion books by an even greater amount - really only kept setting books.
I've since added HC CRBs for Dungeon Crawl Classics, 13th Age, Star Trek Adventures, Basic Roleplaying, Pendragon 6e and Mongoose Traveler 2. And a softcover of Cepheus Engine Deluxe. Sigh...so back up to using 12 CRBs and 12 rulesets. The difference for me this time though, is that all the splat & companion books I've purchased are PDFs. Bottom line - I've become very comfortable reading and searching PDFs on a tablet, so I'm not missing the print. I only have a print copy of the CRB at IRL tables for my players.
I suppose I could just run the Star Trek verse with SWADE or FATE, the Traveler verse with Cepheus Engine and Pendragon with BRP or SWADE. But I do like how those CRBs enhance or vary their underpinning rulesets, or build upon the previous edition the way MGT2e does with CE (MGT1e).
As to lighter rules, I'm fine with heavier crunch in some of the rules I use. I'm also big on tabletop miniatures play and a number of the players in my TTRPG circles are too. So with such rules often being crunchy, it sort of flavors what my group and I like in a TTRPG. We have used lighter rules in the past like AGE, FAE & Tiny D6, but they've only appealed to 1 or 2 of my groups at best.