Hate to break it to you, but in an MMORPG with mirrors, those are HUGE advantages, more so in pvp than pve. But if you think those differences are "minor" for supposedly "mirror" classes and they all happen to be on 1 side. You are truly delusional. Cooldowns, cast times, roots, and fluent play are what makes one class triumph over another, every time.
These games are games of numbers and that extra advantage becomes blatantly obvious. The game is this new and people have recognized these differences since day 1, they are not hidden, they are in plane sight and do effect the core pvp.