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I've tried 4 different HDMI adaptors and all 4 have worked flawlessly - not sure if they supported 4K @ 60Hz though but at least a good indicator that the standard seems very well supported.
 
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My experience is with the MBP versus iPad Pro.

I've tried two HDMI adapters. I used an Anker and Apple one (which requires a dongle.) The Anker had drivers. I suspect these are "universal" versus "Anker" specific. I did run into conflicts with them in some software (and had to update them), so I use the Apple one.

I make no claim one is better than the other.
 
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