@JonTheMon Vintage is the only format with a 'restricted' legality, all the other ones just have 'banned'
Since the idea with Vintage is 'you can play all the cards' the only ones that are totally banned are ones with the Conspiracy type, that reference 'ante', physical dexterity cards (Chaos Orb and Falling Star) and Shahrazad. Everything else that is problematic only gets restricted.
Other formats don't have the 'you can play all the cards' philosophy so if a card is problematic in that format it gets banned completely.
It looks like the updated MTR is working now. From the section on shortcuts
> If the active player passes priority during their first main phase, the non-active player is assumed to be acting in beginning of combat unless they are affecting how or whether a beginning of combat ability triggers. However, if the non-active player takes no action, the active player has priority at the beginning of combat. Beginning of combat triggered abilities (even ones that target) may be announced after any non-active player action has resolved
There is a similar change for leaving the 2nd main phase
Actually, the thing with the triggers make sense. If the NAP acts first in Beginning of Combat, then triggers are announced and resolved, that's functionally equivalent to NAP acting in response to those triggers
Honestly, I would prefer if they would remove all of this shortcut stuff surrounding the main phase, and instead allow players to fend for themselves. I know it's tricky and will absolutely make some people feel bad when it happens to them, but I think that's a fair trade-off for having the rules be less complicated.
But I don't hate it either. I finally like the way they did it except for the caveat I just mentioned that has an obvious ruling that you mentioned.
I think it's really a question of what you want to optimize for. One thing WoTC seems to have decided is that players should not be required to understand the minutiae of priority rules to play the game, and all of the shortcut rules are basically designed to allow for that.