You’re right that only time will tell, but I have personally spoken to many customers (and potential customers-to-be) who have said that Fibery needs forms before they would fully adopt, in just the same way that HereBeBeasties said that the poor notifications made them (nearly) not buy the product.
So should I listen to them or him?
Anyway, it was just an example, and I don’t actually expect a massive spike solely because of forms, but then again, I wouldn’t expect a massive change in activation/adoption/retention if notifications were incrementally improved 
Agreed. But notifications aren’t the reason why people use Miro/Figma/Google Docs I don’t think. And notifications won’t be the reason why people use Fibery.
But I agree that they could be the reason why some people don’t use Fibery.
The question for me is: how many people are driven away by Fibery’s bad notifications (who would adopt Fibery if they were improved) versus the number of people who would adopt Fibery if only it had XYZ feature/improvement?
I just don’t know what the ‘quality vs demand’ curve looks like for any given feature. It sounds as though you (and others) think that there is a bit of a step (aka table stakes) that Fibery is on the wrong side of when it comes to notifications.
Because better notifications = not better something else.
By the way, although this discussion has revolved around the term notifications, I suspect that it is interwoven with chat functionality, so it would be interesting to untangle them.
I mean, maybe for some users, notification is just about knowing that stuff has happened (this task’s state was updated) but for others, maybe notifications needs only to be a layer on top of in-app dialog/communication…
Another long discussion, no doubt!