I mean, to be fair, every new faction basically makes up completely new and crazy rules.

if i understand you correctly, it is very easy to use just the maps and factions included in the original game box. since players first select their faction, then select their map and card deck, you can limit yourself to just the four OG factions and the Autumn or Winter maps. there is a readable rulebook included on the table which i believe has the most recent rule clarifications and (minor) nerfs and buffs to the factions, but in theory you'd be using those updates if you played a physical game.