Having been a PC user for the better part of 40 years, and been an IT field service engineer for a good portion of that
Me too. Obtained my first City & Guilds in Information Technology (way before the cool I.T was used) back in 1991. Then went on to systems engineer and hardware configuring and troubleshooting. I can tell you that I have a high end system and Odyssey runs flawlessly (in VR) and has since Oddy released. (I had a 2080Ti on launch day) I have never suffered the problems that other high system users claimed to have. In fact since Odyssey's launch I have never opened Horizons since.
There are many reasons why a self declared "great" setup (most think only of GPU, CPU & RAM amount) can have problems with not just this title but many. It could be that they have a - on paper good system, but the important Mainboard or Power supply are woefully inadequate. Prebuilds are notorious for corner cutting but as you are aware, many people see numbers and think "It's a great system" Many think 30 series must be better than an old 20 series GPU because it's newer and higher clocked etc... Even if they have a 3050 (Some just don't understand the last 2 power numbers) Also, many I see reporting poor performance don't always put up their full specs. Then you have the Laptop gamers, who are unaware of the disparity between desktop and mobile GPU'S. The motherboard is the heart of any system, and my guess is that these great systems with massive problems are lacking in quality components, and a high end board capable, along with the Power supply of providing a reliable amount of juice to serve up a pleasurable experience.
I see this so many times on the ED reddit (spit...I know) subs. They have the latest gaming powerhouse with a 3060 and 32GB, they just don't realise that the crap bundled with it is hampering their enjoyment.... But, yeah anyway, as I said, have been with Odyssey from launch, never had any running problems with it. I just build my rigs with quality bits. Also I can't remember where, but I read on some forum that the latest Intels are way above performance in ED than big red. Can't confirm as I only use Intels.