You mentioned everyone getting more Debuff resistence. Okay so lets add this little number to your Feoh hatred.
1.Feoh, you only talking about Stormscreamers and Mystic Muse, they are the only 2 Feoh classes who can "stun" and they can only stun when they land a debuff on the target before launching Burst to stun (According to your earlier text, DEBUFFS do NOT land)
2.Feoh, 2skills Magical Warp and Magical evasion, those skills only work when on flat terrain or when there is plenty of place to jump into, But in order for those skills remove your target they must be right next to you. So Feoh uses those skills more for escaping and not trying to remove your target.
Idk what Class you play but i am 109 Feoh in Exalted Gear if i dont permanently jump jump away I am a Dead 1shot to most classes.
3.Feoh, again Hold is a debuff and as you said people stack up debuff resistances(you know funny feohs cause nobody would actually use Hold). Also 1.100 Range is a joke. Feoh range is 800.
if i setup to auto xp with stand, with long range next target i pick target 900 range away. i will not get xp cause my char does not run the extra 100 range to start using spells.
4.Feoh, Fear never lands on players unless they are like 3lvls below your own. and again DEBUFF resistance!!!
5.Feoh. Immune to dmg: that skill says it lasts 10 seconds but usually it does not start working until timer says 7-8seconds left and the cooldown is like 5-7mins long.
6.Feoh Levitate aka Hell binding: works great on Mobs but on Players again only if they are 3lvls below your own and again debuff resistance!.
7.Feoh Mana Barrier and the Body to mind skill: Believe it or not but i had Iss`s kill my Mana and delete Mana Barrier quicker than you could say jippiyajo Piggybag.
Point is yeah sure Mana Barrier helps Feohs a lot but have you ever played a Feoh without Mana Barrier in pvp? I get 1shot. so Mana Barrier makes it a 2shot woohoo..
Those Feohs you complain about can probly kill you without using Mana Barrier cause they have GEAR.
About your Tank list. I can just tell you from experience I fought alot of Tanks and once they enchanted their Chain strike and Silence skill. it was Game over for me being a Feoh.
everytime i warped away the tank INSTANDLY chained me back in and Silenced me.