You can confidently say that this is fine for most consumers today. There really isn’t a great argument that this will serve most consumers well for the next 3 to 5 years.
People have been saying that for years, my 8gb card is chugging along just fine. The race to vram that people were expecting just hasn’t happened. There’s little reason to move on from 1080p and the 75+ million ps5s aren’t going anywhere anytime soon.
What exactly do you expect him to say? Get the same GPU, but with more vram, at no extra cost?
If you want more performance, you pay more, that’s the way it’s always worked, and he’s correct in that 8gb is good enough for most people.