Ok so now that we know STR no longer affects parry amount, and we have a flat 20% parry.
The next question would be, Has parry rating been changed as well? Does it scale better, worse, the same?

My gut feeling is even if it scales better (more chance to parry per point of parry) now that it is capped at 20% mitigation, it probably still is the worst 2ndary stat for tanks.