Yes, better to win in straight sets but if not then losing the first set then overall winning the next two sets pretty cleanly is about the next best option. Though steve is right that you are putting yourself at risk for later ( 6-3 in the final set here was just one break up ).

More generally yes it is all about the win and some players ( Kyrgios for example even on days when he is focussed on winning the match ) can let sets go. That is surely though generally from well down, not in a set where 5-4 down before the final game of the set as here with Evo. So no doubt he lost that final game and set fair and square rather than anything tactical on this occasion.

On a tangental note, I have said before I have a bit of a problem with UTR giving quite a bit of credit to competitive losses. The exact details I don't know but they do make the point themselves as a supposed plus that players are thus encouraged to fight for every point. Now as a pro that doesn't always make sense, and the win is indeed the thing. Though I can see that maybe at younger ages it is a good thing to encourage for such as focus and concentration so I come and go a little bit on that one.