It's not about rules light.I ran Abomination vaults for a little bit as a method to learn PF2E, and found that the the complex rules made dungeon delving a chore. I ran and played in a 5E Rappan Athuk game with similar results, plus incongruities of matching that system to old school sensibilities. There were other attempts at dungeon crawling with PF1 and 3.x era D&D, all failures to some degree or another.
Upon discovering 5 Torches Deep, Shadowdark and other rules light D&D inspired games, i have come to the conclusion that dungeon crawling requires a rules light approach in order to be fun. Unwieldy, complex systems are slow, and turn the crawl into a grind. The juice isn't worth the squeeze, as the saying goes.
Do you agree? What are your thoughts on dungeon crawling versus rules complexity?
It's about ONLY using the rules the DM and players both care about and NONE of anything else.