Yes, they (the refs) try to determine intent. And if the WR is downfield making " extended blocks, like Kearse? tried to put on Browner," they will usually get flagged. It's why I disagreed with your contention.
What happened with Kearse and Browner generally only happens within 1 year of the LoS because it's completely legal for a WR to straight up block in that situation. Down field requires more finesse. On most of those routes, the goal isn't to actually contact the defender. Rather, it's to take a route that forces the defender to go over/under/around, opening up the other receiver.
