Interesting, I'd be curious to know why you all decided not to go with it if you're open to sharing! Minimally to know if I should look at any other promising frameworks.
My secondary concern with Lit is the additional complexity of using shadow and light DOM together in long lived React/Angular apps. Adding a new paradigm for 75+ contributors to consider has a high bar for acceptance.
And yes attempting to add a new paradigm for that many people is I am sure quite the task. More political than technical in many ways as well.
Thanks for sharing!