Sure, but the current console don't have other RAM to fall back on and can't use the full amount of VRAM within it due to OS constraints.
But here is the thing, Sure, the PS5 Pro has 16 GB, but only 12.5 is useable of GDDR6 that runs at 560GB/s on AMD's tech, which isn't the greatest. It uses GDDR6 for both the OS and Gaming on a PCIe4 bus. In the future, I could see the PS6 having 20GB GDDR7 on PCIe 5, while having only 16GB useable which puts the 5080 in line with memory for the PS6, while still outperforming it. But by the time the PS6 arrives, we will have the 60 series which will also be at 20GB GDDR7X or GDDR8 on PCIe5 or PCie6 if it's established, but I don't expect that till the 70 series..
The 5080 on the other hand is running on 16GB of GDDR7 at 896Gb/s on desktops that also may have 16 - 128Gb of DDR5 or DDR6 (when it arrives) with super fast SSD's that can utilize Direct Storage on a PCIe5 bus if need be.
Not only this, but consoles are meant to be energy efficient and not draw a ton of power, so PS5Pro is sitting here at 200W whereas my 5080 can utilize 400W of power on it's own while my CPU uses around the same. It's not really apples to apples.
I still stand by the fact that the 4090 compared to the 3090 is night and day with the same amount of RAM, but people need to look at bandwidth, and speed. These video cards churn data in and out at a fast rate which may lead into less RAM needed to accomplish the job.