A first gen product has more than 10% of the sales of a eight gen product? That's absolutely amazing. I expected it to be a failure because it has limited performance.
How is the quest 1st gen? There have been headsets for VR for quite a while already, including phone-based VR prior to that, so it's hardly a "first gen" product at all unless you narrow down the definition to mean exactly what you want it to mean.
Most people in the VR industry would strongly argue (myself included) that the Quest is the first legit attempt at a consumer VR headset. Before the Quest I never told anyone to go out and buy a VR headset. Now, if they ask, I recommend buying it. The one rough edge with the Quest is the weight. If they knock it down a few ounces I'd argue the Quest is basically the MVP for some startup to create a breakout killer app for VR.
What killer app for VR though? It is not like nobody tried to do VR games yet. The lack of any real worthy software after years of developing games is a sign that it is probably far from obvious that VR games will be a thing beyond a gimmick.
Quest may as well be the first VR headset ever, PC VR was never ever going to take off. Normal people don't want tower PCs in their homes in 2020 and VR needs 6DOF headset and controller tracking to actually be good anyway.
Silly to compare it to literally the most prolific games console manufacturer ever.