We don't need ultra Progressives in those positions any more than we need ultra Conservatives.
That is why Biden was the best candidate among Bernie, Warren, and himself. He is the closest thing to a "return to center" that appears to be running in the next election.
It is a failing of the primary process that no other Democratic centrists made it into the final three.
Just as dangerous as someone who's out to lunch taking advantage of their advisors is advisors who take advantage of someone who's out to lunch. I don't want a 'President by committee' and it's time that the members of Congress start working for the benefit of the country, rather than their party.
I'd disagree that it is "just as dangerous"! Reason being that the president (with Trump as example) can eliminate experience and expertise around him and has done an incredible job of cowing Republicans into submission.
However, anyone in an advisory capacity is much more subject to being challenged if they start "manipulating" the president. Whistle-blowers do serve a very important function!
While this is specific to Biden, he has the decades of experience in DC to know who to put in his cabinet and in charge of committees that understand his objectives and he can trust to act in the best interest of the USA (at least as he sees it). I believe anyone with his long history will have several people who he can trust to give him good advice and apart from some sort of major delusional dementia, will always rely on them (be it chief of staff or personal assistant).
Part of my reasoning is also how in the case of the current pandemic, any conceivable president is going to be in a state of confusion (except Trump who just doesn't realize it), but the system is set up so he relies on the conclusion of experts for the decisions. That is the system Biden is steeped in, so he is comfortable with it as natural process to obtain consensus.
In contrast Trump is used to being able to use his money to manipulate those around him (and has successfully adapted to using his political influence where money no longer works) and is absolutely not used to ever being held to account (that is why he so aggressively wants to destroy anyone who speaks out against him as best he can)!