I've played M&T 1 alot. It can handle fairly large amounts of figures. How many is somewhat restricted by the figures being individually based. I wouldn't attempt Saratoga or Plains of Abraham with it. Stony Point maybe.
But M&T 2 is another matter. I've read it through once, and its definitely more fiddly than the first addition. Each side having a separate hand, with cards in the hand potentially from BOTH sides, might make larger battles too confusing.
But I don't know yet. The rules came out just as the pandemic hit, and I've yet to play them. There are a couple reviews out there, and an AAR. Also, youtube videos on how to play. My feeling is you need to play a bunch of small scenarios to get a feel first.