I'm not sure how to cut your entire quoting of my post and yours - my apologies and I'll edit if I feel like it - but there's plenty of info on the 'netWhat are you talking about. HDMI 2.1 supports 10K at 120Hz, Dolby Vision, HDR10+, etc. Max. transmission bit rate is 48 Gbit/s. Max. data rate is 42 Gbit/s.
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HDMI - Wikipedia
en.wikipedia.org
If you're claiming otherwise, then quote your source.
The real reason(s) that HDMI 2.1 isn't supported are:
1. The chips themselves don't support the bandwidth, with max output at 40 Gbit/s!!!
2. It gives Apple another feature to upgrade in the future to push people to upgrade to a newer machine.
Thus, none of the M-series chips support 8K displays so far. Sure, the chips can process 8K, but they can't output it to an 8K display. Thus why everyone is wtf, so first have to export the output and offload it to another machine to watch it on an 8K display. Bewildering.
I didn't say a word about 2.1, I know the difference - the point was the same way you run a 5 or 6K display, via Thunderbolt dude - chill man.
Source 1 quote *I'll post more if I feel like it - I'm tired, just got off work - but for 8K color grading, the high power mode allows the user to color grade 8K footage
WOW - on this very site!

Apple Says High Power Mode on 16-Inch MacBook Pro With M1 Max Designed for Tasks Like Color Grading 8K ProRes Video
As we previously reported, we've received confirmation from Apple that 16-inch MacBook Pro models configured with an M1 Max chip feature a new High Power Mode that is designed to maximize performance during intensive, sustained workloads. MacRumors has since obtained an internal Apple...
Thunderbolt 4 may have less bandwidth but it's bidirectional (like a freeway), allowing the transfer of {+Power} that 40Gb/s each way, intelligently slicing the bandwidth to the peripherals in need - HDMI rocks, It's a great cable, but it doesn't have to send 48Gb/s back to the pre/pro, AVR or source - it's a ubiquitous standard on cameras as well, but 8K shooters are paying multiples for their capture gear (camera, drives ((storage)), glass, audio capture and tripods, fluid heads and radical rigs with ...no, not 8K displays ((or even 8K viewfinders?). Hmmm that sucks, not seeing every pixel in the shot while shooting - don't it?
I'm not sure who the "all of you going wth" about HDMI 2.0 being on the MBP when you have 3 separate Thunderbolt 4 connections that are theoretically 15-20% slower, but capable of its true, advertised speed both ways - while HDMI 2.0 isn't saturated fully at it's theoretical peak speed of 48Gb/s Out, not I/O
Anyway, chill dude, there's not a single laptop on the market capable of editing video like the new MBPs, none, zero zilch - especially unplugged 3 x 6K displays though, and a monitor @4K plus internal is pretty dern cool - and I've been using Proxies for decades - I don't shoot 8K, nor do many people I know.
And I'll say it again - content is king. period
Perhaps you're unable to frame your shot correctly, that just takes time to learn - or a better piece of glass, 'cause the only reason to shoot 8K today is to crop a 4K story
Too Tired, if you whine again though, I'll get back to ya
Peace
J