Some people [1] attributed the failure of the Russians to go to the Moon to the complexity of the N1 rocket with 30 engines. Let’s see how it works out this time.
Since this is a reusable rocket stage static fires of some or all the engines at once will be possible.
That's a joke, of course. The N1 problems were specifically in turbopumps - chambers themselves were relatively robust - and R-7 has those 32 chambers distributed among just 5 engines, one turbopump assembly each.
Regarding N1 I'd say the problem was not as much the complexity of the first stage, as complexity of engines, which couldn't be compensated enough by clever tricks of the rocket itself. NK-33, the next version of the engine, flew successfully at the first try after some 40+ years in storage.