Sanchez was pressed aswell, he just has the ability to play himself out of it. I was impressed with his footwork in the final. If he would be as bad as Smalling with a ball than first of all Ajax would not have signed him as they require their defence to build play from the back and need good footballers to do that and secondly Barcelona and Real would also not have been interested him as they require basically the same but on a higher level. Sanchez is also the type of defender that goes forward and contributes with goals, last year he scored 6.
Sanchez is obviously raw and he will make mistakes, perhaps that is why you are calling him atrocious but he has a shitload of potential and many top clubs are very interested in him and he will likley go for more than £40m. We couldn't even sell Smalling for half of that if we wanted to because he such a limited player with no skills on the ball and no pace.
I'd urge you to watch the final again, and see how often Sanchez brought the ball over the half way line totally unopposed as we backed off and backed off, and then how often he just hammered it across field to nobody. And then see how quickly the even-younger De Ligt was pounced on as soon as he got the ball, cutting of all passing options, except for to Sanchez or back to the goalkeeper, because De Ligt can play the ball well. Even just watch BT's analysis again. They showed all the times we continually backed off from Sanchez and let him have it. There were a couple of occasions where he'd ran in a straight line until he was about 35 yards from our goal before we finally moved towards him. He didn't ever "play out" from anything. He was so clearly not deemed a threat with the ball, and quite rightly, as he never did threaten with it. He had the most touches of any player on the pitch in the final, because he was allowed to do so. De Ligt had just over half the amount of touches, as he was targeted. Mourinho confirmed this.
Defensively he was excellent, and as a pure defender he has all the physical attributes, but he was absolutely not the ball player that night, or any other night.
Sanchez has a lot of potential, but I can't see him all of a sudden becoming a ball player. He just isn't one. I haven't seen anywhere where he is supposedly renowned as one, and whenever I've seen Ajax, he is never that player. There's nothing particularly wrong with that, as not every centre back needs to be a playmaker. I personally prefer a CB pairing of a ball player and a brute. Sanchez is the latter, and unless he has some enormous transformation, that's where he'll develop.