I'm not disagreeing with you, it was the right decision.
But the way defenders can get away with wrestling in the box (particularly at corners) is also a bugbear of mine. In that Morata incident, the defender has been turned, he's been done and Morata is away. So with both arms, he's grabbed...
http://www.bbc.co.uk/sport/football/42630626
That Willian one is a stonewall pen, I dunno how anyone can argue otherwise. The defender makes a desperate lunge and gets absolutely nowhere NEAR the ball, but makes clear contact with the player. If that had been (say) Gross on the end of that...