I see a good case for my company to use Lit for creating complex components such as highly interactive panels/widgets to be shared between React/Angular apps in our large ecosystem. However the decision was: 1. Prefer sharing plain JS/TS over framework code so try that first and 2. if the component is so complex and tricky to get right, it probably needs to be re-implemented in each framework anyways (or some sort of wrapper)
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.
Ah yeah, definitely a much different equation when introducing this across many apps as a shared component library. Mixing different DOM abstractions together could get tricky for sure.
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!