Warning: This is gonna be a long rant.
Wow... so they actually removed the HDD and simply left a gigantic hole there. Would it have killed them to use the iMac Pro chassis for this last iteration? How much could it have cost them? To have that technology at hand and simply decide not to use it, and recycle the same old cooling design, is so... cynical. It's consumer hostile.
For me, this decision is the apogee of a very long list of weird, nonsensical choices and design decisions made by the mac divison at Apple since roughly 2013. And you can't blame Intel for all of them.
For instance, both me and my wife were huge fans of the original, super popular Air from its 2011 days. Back then, Apple had managed to build the perfect computer. Super light, reasonably fast, versatile, with a nice selection of ports, a great battery, great screen, it had everything for its time. It was so good that I used it as my main computer for more than 3 years, including gaming (WoW). All they had to do was update and improve it. And that's where it began: they started to neglect it. Kept the same bezels, same screen for so many years until it started to feel old. At one point (about 2015 I think) they also forgoed the yearly updates and just kept it around, with old CPUs and everything. The thing was so popular, people were still buying them, even with such old tech.
ALL they had to do is replace the screen with a nice, bezeless (probably 14inch), retina display and replace the old Thunderbolt 2 port with a 3. That's it. And it would have been the most popular computer even today, in 2020. Not Apple, though. Instead... they gave us the Macbook. Which we all know how it turned out. Too small, weird keyboard, bad port selection, slow... it wasn't a proper replacement, if any.
And then they when they finally remade the Air... it was also compromised as hell. Bad keyboard, slower CPUs, bad port selection, and on top of it all noisy like a jet. Even today, after all the "fixes", the Air is still not a worthy successor to the legendary old Air. It uses slower, Y series CPUs and it's far noisier, because apparently heatpipes should be reserved for "Pro" computers only
The 2013 Mac Pro was also a kind of a trainwreck. Nicely designed, but they left it without updates for oh so many years. Then the 2020 Mac Pro came, but at a price point few could afford.
I could go on and on, but I think I made my point. Every computer Apple makes these days seems to be some sort of weird compromise. With all the products they make, it's like they tease you but they want you to suffer.
Back to our subject, where does that leave us? You can get the new iMac, with bad cooling and new tech, or the iMac Pro, with nice cooling but 3 year old components - at the same price, of course. Which, in my country, is exactly 6356 US dollars, and that's because it's discounted a bit. Worth it for a Vega 56?