And a few years ago, when standing behind a boss was a given, that mechanic worked fine. These days there are all sorts of boss mechanics that have the boss randomly turn for a second or two, then turn back. Or where you need melee stacking up in front of the boss to help soak a meteoric damage attack. In all of these situations, melee suck up a relatively high parry chance, and can miss attacks at inopportune times for large damage loss.
Given that for several tiers (expansions even) ranged superiority has been pretty much the name of the day, it seems like this mechanic that exists only to punish melee further with ever more common boss mechanics is outdated, and it's time to let it go. I still like the Expertise/Hit model that has us gear around a stat cap, but that stat cap being arbitrarily higher on some encounters for melee is silly, and is what needs to change.