I actually agree with Fung. For a number of reasons, New England rarely votes out incumbents of any party.
There's a ton of Biden seats where if Rs win in New England they could probably hold even in a better year for Dems (CT-02, CT-05, NY-18, NY-19, NH-01, ect). I've always wondered by New England specifically always seems to be quite favorable to incumbents. Perhaps it has to do with the culture, specifically in a lot of these well-off communities of just re-electing folks unless they've actually done something offensive rather than just being angry.