I mean, if GPUs launch with perfectly optimized drivers then driver UPDATES don’t matter, but drivers literally translate foreign nonsensical (to the GPU) shader code into instructions the GPU understands. Without them, your GPU is as useful as a brick. The driver situation is not there yet especially for NVIDIA GPUs. There’s a reason I run mesa-git, driver improvements absolutely do matter.
Both. I like the customizability and power of a desktop, but I like the portability of a laptop. If you can afford both, why not have both. I often have my laptop set up next to my desktop for browsing/chatting while gaming and I also often just take my laptop to game when I go to friends’ places. Also, they’re both PCs.