I can’t see how a healthy browser extension ecosystem would help
Google. Without Google getting any real value out of it, it makes total sense they do a poor job managing it.
I somewhat agree, yet wouldn't a healthy extension ecosystem (excellent term, btw) attract more users to Chrome and in turn keep users more entwined in the larger Google ecosystem? I guess there is a cost/benefit analysis done. They put just enough effort into it to get the return or results they want. The little guys like OP (who arguably make the best content because it's open source and not full of trackers or other junk) just get stepped on along the way.
I don’t know at all, but if I had to guess extension usage is pretty low. I’m not sure the average user really sees browser extensions as something they need. They aren’t as obvious as say mobile apps.
On the flip side, extensions like Honey seem to suggest at least enough people use them to be of some worth.
Some of the more popular extensions have thirty+ million users, and this is for trivial fluff functionality. When you hit up the extensions dealing with adblocking or say, interacting with Instagram, they can hit 100+ million easily.