Remember, Elon downsized Twitter by 80%, and then Twitter lost 80% of it's value. Simply firing a bunch of people doesn't accomplish more, it can actually destroy the value of the thing to begin with.
We've all seen this with republicans before. They take over, make things worse, and then use the fact that things are worse as an excuse for why the government shouldn't do the things it does. Elon isn't an expert in efficiency, he's an arsonist coming in to destroy the government so he and his buddies can extract more value out of this country.