a real world consideration in HT is the screen, formats, and speakers.
HDMI is already at 2.0 and about to jump into HDMI 2.1 or 2.2. to accomodate forth coming screen resolutions and other new tech.
I'd ensure both HDR and Dolby video are supported in what ever proc. at least.
having something and not needing it is better than not having something and needing it.
then therer's the amp to speaker concern. ya gotta have the right combo in that respect. receivers even at the top tier don't always have the true juice needed to accomodate any sort of speaker impedance curve and in my exp, I've always found dedicated amps the usual first upgrade.
yes. I have a 5 ch amp yet I'd rather have and should have went with a two ch and a three ch amp instead, or at least two 2ch amps and used the Receviers amp for the center ch.
ATMAS or the over head speaker array simply does not interest me. $$$$$
I'd be more interested in networking, blu tooth, upgradability, and local support.
good luck.