I should specify I was talking about chromecast specifically - I think it may support other protocols.

That being said, I can't find the cast button you're talking about.

I also can't find the sharp edges you mention[0] could you give other examples? In my experience I've just had it do what it says on the box with no fuss.

[0] though I'll admit my tastes are minimalistic and I avoid cloud tools as much as possible - either or both of those may color my views.

For example, I see not having access to Youtube account information as a positive.