Well, Hindley is 29 and Uijtdebroks is 22 so of course Hindley has shown more by now but Hindley at 22 had done nothing of what Uijtdebroks has done so it cuts both ways.
Hindley isn't really an outlier other than he has actually won a GT. But if you compare him with other GT riders then he is part of a large group of similar level riders that I would call the top 10 gang. These are riders that ge top 10s in GTs and week long WT stage races but rarely make the podium in any of them.
It's riders like Thyman Arensmann, Felix Gall, Pello Bilbao, David Gaudu, Thibaut Pinot, Romain Bardet, Louis Mentjes, Mikel Landa, Steven Kruijswijk, Ben O'Connor, Damiano Caruso, Domenico Pozzovivo etc. just to name a few.
I'm even tempted to add Enric Mas to the list but he has at least been on the podium in 50% of his top 10 finishes so he is more of a consistent competitor though looking at his WT stage races he is more of a clear top 10 gang.
Almost anyone of the ones I mentioned could have had a win in a GT just like Jai Hindley if the stars had aligned just a little better for them at the right moment.