The Emily Maitlis row isn't a question of 'bias' or whether what she said was 'true'. It was editorialising, which arguably has no place in the Newsnight format.
But it *is* a question of the BBC's general bias against a certain flavour of editorialising.

Laura Kuenssberg's Twitter, on the other hand, is a direct communication tool for Dominic Cummings, skulking as a 'source'. That is much more unprofessional than Emily Maitlis currying favour with viewers by reflecting the majority view in her intro to the programme.

As an aside, apart from passively receiving 6 Music 'news' bulletins regularly (themselves largely consisting of HM Government announcements) I stopped listening to, watching & reading BBC current affairs output in December 2019.

I am no less informed than before

It won't be a popular view in my bubble, but if I were still a Newsnight viewer I wouldn't want it to be a 'nice' version of Fox News. And although the job of a presenter is partly to mirror 'the man on the Clapham omnibus', there are less intrusive ways than Maitlis chose.