Sadly, this is where theory and praxis diverge. As someone who has to give talk in all kind of venues all over the world, I've encountered probably every single problem that can go wrong here: incompatible cables, weirdly set up beamers, you name it. The thing is, with an array of adapters from different vendors (using different internal chips), you are pretty much guaranteed to have a working solution. If the beamer cable doesn't work with your built-in HDMI port though (or the port itself is broken), well then you are really screwed. This is why full TB3-solution is most flexible and ultimately most reliable for professional setup. Yes, you need extra adapters. As you always did. Actually, I need less adapters now than earlier, since I can use multiport ones.
My own experience and observations are that dedicated ports are more reliable, once you introduce dongles, especially those with logic on board your adding another layer of complexity, this is obvious to all. In practice for my own use plugging in the display device directly to the notebook as a rule works, nor do I have any control over the hardware at the venue.
I am not suggesting that the PC or W10 is anyway better than OS X, What I am stating is Apple have added in additional complexity which can and does fail from my experience. Apple's solution fails for many, as unless you know what adaptor works, where do you stop purchasing. I don't mean the physical contain rather more the connection status.
With my own 15" notebook being screwed is highly unlikely given it has 3 video outputs; mDP, HDMI and shockingly USB C, only adaptors needed are for DP & VGA, with the latter becoming less common. As for TB-3 there's hardly any display devices out there that use the protocol, nor will there be for the most part. As for USB C enjoy your dongles as little in the real world is using the port in any consequence.
I like USB C & TB-3, I do equally I am a realist and understand Apple opted for USB C for solely it's own benefit, not it's users, mostly to produce a thiner toy, given the target audience...
Q-6
