While I think you've gotten a basic gist of things, be aware that most HDMI cables sold today are either rated for 4K at 18Gb/s or up to the full 8K spec and 48Gb/s.
The idea of 'investing' in cables is ridiculous, since in a few years they will be considered obsolete anyways. You buy cables to throw them away at some point in the future. What I'm trying to say is... DO NOT OVERSPEND!
If your setup doesn't need 8K cabling, because most of the time it doesn't. And you don't need the 48Gb/s specification that goes along with it, then spending more on 8K cabling may seem wasteful at this point. But, there are plenty of cables out there that happily carry the designation and don't cost a lot more.
In reality, I would just head over to Monoprice and get their 8K cables at 6' or less and roll with it...
Monoprice, Inc. (DBA. MonoPrice.com) specializes in the wholesale distribution of world class cable assemblies for home theater, PC, and high technology industries. MonoPrice.com offers a wide range of products from standard PC products, network cables, and HDMI cables to custom cable assemblies...
www.monoprice.com
A big issue I have with the above linked video is that they did a LOT of testing with cables from Monoprice and the only 15' cable they tested at all came from Monoprice, so it isn't shocking that they saw more failures with the brand they tested the most from, and at the longest lengths...
Read the actual results in the Excel file on this page:
We told you we’d do it, and here it is! Testing a whackload of HDMI 2.1 and 2.0 cables to find out if you’ve been wasting your money on cables for no good reason. Data from tests is attached to this post. If you are an educator or otherwise have a legitimate reason for wanting to look at the .jso...
linustechtips.com
What you will find is that if you are truly pushing full 8K content (48Gb/s) you can pick up cables for under 20 bucks a pop which are likely to work just fine for you.
If you are pushing 4K content, then you will have basically no issues whatsoever.
Don't overspend.
Grab an extra cable or two just in case. Nothing really is worse than needing one extra cable and not having it.
I AM A HUGE FAN OF ULTRA SLIM HDMI CABLES! They are lightweight, don't pull small gear around, and they stay in place. If 4K is plenty for you, get ultra slim cables and call it done.
Monoprice, Inc. (DBA. MonoPrice.com) specializes in the wholesale distribution of world class cable assemblies for home theater, PC, and high technology industries. MonoPrice.com offers a wide range of products from standard PC products, network cables, and HDMI cables to custom cable assemblies...
www.monoprice.com
For normal 4K content (18Gb/s) this is my go-to cable and it is awesome:
Monoprice™ Certified Premium High Speed HDMI® Cables are designed to meet and exceed the highest standards of HDMI performance. Capable of delivering 18Gbps bandwidth, these are the only cab
www.monoprice.com