The problem with the Cunha incident is that the consequences of the action bear no relation to the seriousness of the offence. You're gifted a goal and your opponent is reduced to 10 for a marginal foul on the edge of the box. Feels like you're rewarding that kind of s***house behaviour by forwards.
As for the fouls in the Arsenal game, the PL were making a big thing about holding offences at the start of the season; they seem to have given up on that entirely. Arsenal aren't the only team to do it but some of the stuff they got away with at corners yesterday was mad.