E-ARC is one of the least useful things ever added to HDMI, but quick media switching and quick frame transport are worth waiting for, in my opinion.
The only thing less useful than E-ARC is ALLM.
E-ARC and ALLM are getting, by far, the most discussion of HDMI 2.1's features, aside from perhaps 8k. Maybe this is simply because these features are relatively easy to add and manufacturers are already adding them and thus people are talking about them. I dunno. But I don't think either feature really deserves the hype. The expanded audio format support over E-ARC is "meh" because it's only useful for the TV's own apps (or tuner, if your TV even still has one of those) and... well, why would enthusiasts be using those in the first place? And would "casual" users (who would be more expected to use TV apps) actually even have an advanced audio setup that could take advantage? I say it's doubtful and so I think E-ARC is useless.
As for ALLM, it just automates changing some settings that should really just be changed anyway. There shouldn't be much need to have the set toggle game mode on or off. It should stay on for inputs used by gaming systems, and off for inputs not used by gaming systems.
Switching cable channels, or switching between sources, shouldn't give 5-10 seconds of a black screen and I've been waiting for this problem to be fixed literally since the very first time I used HDMI, so QMS and QFT are what I want. Oh and Variable Frame/Refresh Rate (VFR, VRR, Freesync, VESA Adaptive Sync, whatever you want to call it) too.
E-ARC has nothing to do with video. It's strictly an audio feature, and it's strictly only useful when you are (for some reason) using your TV's smart apps (which I seriously recommend you do not - there is not a TV on the market that comes with quality apps - or if they do then they will be run on an applications processor that runs slower than the smartphone you had 5 years ago. And then the apps will stop getting updates practically immediately, and then when streaming services update their API, your stuff stops working.)
Last edited by DonoMan; 11-21-2019 at 08:53 AM.