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An experienced staff member will know how to protect themselves which would put a limit on their ability to do damage.

Are you seriously suggesting that literal traitors would be better bodyguards for the president than noobs (only relatively speaking, since there are plenty of non-career-USSS folks who have done personal protection duty before) would, because traitors know how to cover their tracks? Or am I radically misunderstanding you? Because if I understood you correctly then that sounds like insanity.
We might as well resurrect John Wilkes Booth and Lee Harvey Oswald and have them guard our president. They really knew what they were doing.
That he wanted the dude fired isn't really newsworthy, but how he learned about the usher meeting with Biden is. The Secret Service told him. That means at least one of the Secret Service agents assigned to protect Biden at that time was sharing information he learned while on the job with Trump's people. No wonder there have been reports of Biden being careful of what he says around the Secret Service. >

I still don’t understand how Biden hasn’t cleared out the SS. >

It’s a group of very specially skilled, highly trained people. They can’t easily replace the entire detail and even if he did with agents from other areas, there’s no telling that would be any better.
His only other good option may be a military detail and that comes with its own host of issues. >

Having a group of specially skilled, highly trained people betraying your interests to work against you sounds like it would be worse than having a less skilled less trained force that is actually loyal. >

That's just choosing between the devil you know and the devil you don't.
You can't know what level of exposure you will get with a green member of staff. An experienced staff member will know how to protect themselves which would put a limit on their ability to do damage.