The biggest issue really being that the C8 ARGB is likely the better choice for many
That is so true. The A-RGB variant has much more value, as it comes with three fans, two of them reversed 160mm PWM fans with 35mm thickness. The C8 RGB with this two fans is very obviously intended for large and largest GPUs.
I don't know of any case on the market that has >140mm fans directly (and with directly i mean GPU dedicated) oriented on the GPU. And additionally with no intake obstructions whatsoever. This case was build for a 4090/5090. The 2x160 fans are covering most of the cards length (even if you own a lengthy 4090 Master). There are of course some cases with even bigger fans, but never solely dedicated to the GPU. Most other cases with oversized fans find space in the front (e.g. designs by Fractal Design or Cooler Master).
So imho this Antec C8 design in the RGB version is a game changer for great GPU temps and an optimal solution for a 4090/4080/7900XT(X). Somehow most reviews of the C8 RGB variant fail to mention this.
Obviously, in a double chamber case one needs to populate the side intakes too. This is a must to create some air around memory, CPU and VRM areas and the back side of the GPU. Especially with a large GPU, as a physically big card will eat/block most of the air coming from the bottom fans.
If you populate the side intakes you get top mesh case performance with CPU and GPU on Torrent level. Yes, really. And that's with an aquarium case! Maybe one can achieve only very good temps for CPU, as you still have a slight disadvantage with the front side intake compared to a front mesh airflow to the CPU area. In the c8 and comparable cases the back and top outtake fans will need to do the work to create the airflow, but without the side intakes there won't be any. So you need to configure those dual chamber designs the right way, but then they will deliver.
So, the C8 with the two stock 160mm in the bottom has the potential for top level cooling! Mesh case, step aside. If you don't believe this check out the Gamers Nexus review of the C8 A-RGB with stock cooler config out of the box (without any side intake or top outtake). They loved the C8 stock. It performs and feels much better then more expensive cases like Corsair 6500x. Even at stock the GPU temps perform on a top level, beating most other modern cases. CPU temps were higher, because they left it at stock and choked the area above the GPU. One just needs to put some more fans in this case and create an airflow behind (above) the GPU and this design will easily lead the GPU temp benchmark chart of a modern case roundup (the GPU getting air from behind the card will even improve more) while delivering very good CPU temps too. If you plan to get an 5090 and leave it on air cooling, get this case. I'm not joking.
Amazon Germany has the A-RGB variant for 89€, so roughly 96 USD. I guess, Antec wants to increase market share fast with aggressive pricing over here. That's a nobrainer for anyone with a large GPU. Only downside is the lousy fan hub, but I will use a better one lying here (Arctic). I ordered the C8 A-RGB for my 4090 rig to migrate to, just for the fun of it (won't change a thing in the rig otherwise)