SE must be drunk.

[Launched]

That's why I think mitigation skills should scale with the parry stat. Parry would improve your mitigation rate through block and parry and your mitigation power for everything. Exactly like a reverse crit. Of course, stacking a lot of parry should noticeably improve your mitigation skills, above what they do now.

For me, without any parry stats, this new Rampart should reduce less than 20%. If the skills stay natively as strong as they are now, people will treat them like it's "enough". If they start weaker, then people would need at least some parry.

That's a horrible idea, you're just making it into a second accuracy stat exclusive to tanks. Stack parry to X amount so you can survive tankbusters with your cooldowns, hit accuracy cap, then maximise crit/det. That's how it would go.