Current implementations yes but when browsers have 100% integration? I want to say yes but would love to say no. My biggest issues (latency, trying to concat and minify down and duplicative CSS) are not really addressed anywhere but until all browsers have the full implementation I can't say for sure I'll admit.
> I imagine for example Stripe's payment widget could be a pretty nice use case? In other words, higher-level widgets that are substantially encapsulated already, and are already often loaded as remote resources.
That seems like a great use case. I'd prefer, and probably most others, to host my own components versus externally referencing them but in some cases where you can't really get around it (I'm not familiar with Stripe's payment widget but Google Maps is certainly like this) I could see that being a good use case. Honestly that in and of itself may justify its existence but I'm just not convinced of its use fullness outside of that just yet.