McVay does irrational impulse decisions like challenging calls when there is little benefit or no chance to win the challenge.
Calls timeouts when his mind stutters and he can't decide what play to call when he should have had a couple plays ready several downs earlier.
Back when his grandpa was with Niners bill Walsh was the best at scripting plays to start the game.
McVay takes a series or two before figuring out what to do.
Probably why he chooses to kick off when rams win the toss.