> (Conversely, if Safari refuses to implement some alleged 'feature', it becomes much less useful even if Chrome does implement it.) Ah yes... such as push notifications. Firebase would be so much more useful if Safari supported push notifications...
What do you mean by "useful"? I've been using Safari exclusively for years now and the lack of push notifications hasn't been a problem. It's actually good because it shields me from all kinds of shitty websites demanding notification permissions while having no good reason to send any.
Isn't a notification receiver of the most important uses of a phone?