Naatkinson says:
So I have a concern about going battle master... I will have the ability to do things like knock people prone and whatnot, which will affect my actions for the remainder of my round. How should we deal with stuff like this? Because most of it requires saving throws on the part of my opponents.
I'm fine to roll saving throws in "real time" ... I know we're talking a lot about turn order right now, but I don't see any reason to hold up strategic thinking by immediately rolling reactions.
If you're doing PvP combat, it may slow things down, depending on who you're fighting against... but if that becomes a focus of our game, we can deal with it then.