Yeah a seismic charge is a questionable weapon to use against two Tie fighters, and I wonder if this particular one was detonated manually by Boba in order to time the explosion so exactly. It’s fan service in a way. But would you really complain? What are action scenes for if not to entertain you, and for that matter what is this fictional universe for if not to make you happy? That seismic charge made me happy.
(Edit: I am completely aware of how Star Wars is meant to accomplish more things than entertainment, culturally and thematically. But the seismic charges aren’t! They’re just pure fun)