Random thought... what if the 5000-series release, and not just the 5060 Ti, had been today? So the 5090, 5080, 5070 Ti, 5070 and 5060 Ti either all released today, or the 5090 and 5080 released today, with the other cards staggered over the next few weeks, if that makes the logistics easier.
In supply terms, we can infer that the 5090 would have sold out, but that it wouldn't have felt like a paper launch and that, as with the 4090 launch, most people who really wanted one would have been able to get one. Some models of the 5080 and 5070 Ti would have sold out, but if you wanted a card, you'd probably have been able to get one. The 5070 and 5060 Ti would have been pretty freely available. Scalpers would have had a much harder time and the genuine customers would have felt less ripped-off as a result.
The drivers would have been in better shape. While today's release doesn't seem to have been perfect, it does seem to be a big advance on where we were with those 5000-series drivers that first came out at the back end of January. Problems might have gotten lost in the noise around the launch as just the usual teething troubles, rather than becoming a major, brand-damaging story.
And while not certain, there would have been an increased chance that those early batches of cards with missing ROPs could have been caught pre-launch and pulled out of the supply chain, avoiding an embarrassing story for Nvidia.
Some problems would still have remained. The price-to-performance ratio of some of the cards still wouldn't be great. The power connectors would still be incendiary. AMD might have managed to get a first-mover advantage with the 9070 and 9070XT, but people might also have held back on those to see how the 5070 and 5070Ti turned out. Nvidia might not have been able to sell as many US cards before tariffs kicked in, though we still don't know what, if anything, will actually kick in there.
But on balance, surely there must have been some good reasons for Nvidia not to rush things out in January, when it's only really now starting to feel like the 5000 series is "ready"?