It’s an issue for a few reasons.
600W is a lot even in a burst application, and a poorly rated 1000w probably won’t work.
Most people even with like a 3090 dont liquid cool it.
Now I agree on the PSU part. If you are going to spend 4 digits on a GPU, you would be crazy not buying a top end PSU for a couple / few hundred. Just for the security alone, you dont want a shit PSU killing your card.