The issues wasn't whether JV was better than ever. These guys improve every year. The issue was whether he was at his best possible form. And that is obviously not true due to the preparation. Even if his power numbers would have been the same - which is highly doubtful - you can see how much time he lost on the descents this tour - both on stages and TT. Pretty good indication how much the crash had an impact on him.
Does it mean he would have won? Probably not. But trying to draw deep conclusions from this Tour is really kind of meaningless as it was to draw same conclusion from JV dominating Pog last year. Pog goes out and rips him next year with both having fair prep then we'll have the asnswer.
Ad improvement: sure, right now they do so. But it's not that there is no ceiling to this and Vingegaard is 27 and he did kinda push 6.8 watts/kg the other day for 40 min. (Atleast that's the assumption because he said there were very good calculations of the actual numbers) I mean to say: these are all time great numbers. We can't just assume that will go on forever, which is not to say that Vingegaard won't improve next year.
Ad deep conclusions: wasn't trying to draw any. I merely pointed out that I think it's a harder blow when your numbers say you are at your best ever outputs rather than this not being the case, simply because you can't expect your best ever numbers to simply improve significantly. Because that's what they've gotta do because he has ride Pogacar of his wheel because he can't at all match his acceleration with was apparent already last year.
Next year, next round so (hopefully). I'd like to see them meet each other with perfect prep to battle it out. As of today it's unclear who the winner would be. My money would be on Pog though, as he simply has more weapons than Vingegaard. Mind you he had the Giro in his legs and he still did what he did, so we also can't be sure this is peak peak Pogacar we've seen as he's still young plus he could come to the Tour fresher next year.