TwoSix
Bad DM
I mean, all the differences between those rulesets are at the level of the PC; not something that would impact how a GM would run encounters or change any resolution rules.As near as I can tell, as a player, the rule was you run your character. I think most characters I played with were 2014 or 2024 rules, but the GM was not adjudicating individual rule systems, just running things in a loose 5e framework.