Lol, a warrior who can sit in FG SA without even having his hands on keyboard and mouse being completely immune against any CC a sorc could throw at him complains about sorc´s i-frames being invisible for a split second....

Sorry, but if that is an issue for you, you are just bad at this game. I agree, sorc´s iframe´s can be annoying if you try to catch her, but it it is not difficult, all you need to do is wait until she runs out of stamina or grab her (you do know you have a grab, right??) when she tries to recover stamina. And as a bonus, while she is in iframe she can´t do any damage to you anyways and the iframes are very predictable (unlike those of Sage who can change direction while teleporting around).

Do we get Striker damage to compensate for these losses you are suggesting? Lol

Ninja has 2(technically 3) invisible iframe skills, and they aren't as good as you think they are.
Ghost Step is on a 1 second cool down. It can not be spammed, and it doesn't have iframes on start-up. If you go from most ninja skills into ghost step(shift+a/s/d, w+f), you have a split second gap before you get iframes.
Ninja Step doesn't actually turn the ninja invisible, and it also doesn't have start-up iframes. 6 second cool down.
Silent Charge has less protected frames than it has unprotected frames, and they're not at the start-up either, so you can't go from Transition Stance>Silent Charge without a large gap in your protection, so skillful timing is required, or you just CC yourself.
So only concealment and onishadow remain, and they are on 20 and 30 second cool-downs respectively. You can't spam them, and after the initial jaunt forward, you're no longer invincible, only invisible. No, it doesn't grant super armor, and you can't link them reliably, as one overrides the other, and you can't use concealment after onishadow(despite the patch notes saying they fixed that.)
I think the issue lies somewhere else.

Most class in the game doesn't have spamable iframe(apart from sorc) and most classes do have gap at the start.

Well technically that gap is the issue with the shit engine and servers tho.

I feel like some teleporting is definitely fine for the game, (mainly bc most of the teleports in the game that are meant to teleport are telegraphed) but some things are dumb, like i get kuno, ninja, hash, and some others having teleports, but why the hell is warrior basically no clipping around the map, or zerker flying in circles above me. guess the point is teleporting movement isnt the issue when its meant for teleporting, the game not being able to process inputs to have things that normally wouldnt teleport and making them teleport is what is annoying. Ninja doesnt have too many skills that are actually good for movement that are real teleports, ninja step (the zig zag movement skill) has an animation that is (supposed) to play for the other player also, silent charge same thing, ghost step is so short that it really shouldnt be throwing you off but it also has a small lag to it where you can kinda guess where we are going. block jump literally has whole blocks telling you where we can go and the range of the skill. only thing that i can think of rn that is a "teleport" that isnt telegraphed or playing an animation for you to keep up with is boss slaughter, with w input boss slaughter is instant teleporting to you. Boss slaughter makes you linger in an animation completly unprotected tho if you use w input. also most of the teleporting things are normally verrrryyyy short iframes that you can honestly just smack 80% of the player base out of with any big/ multihit cc skill. rn tho in the game it seems like everything is just living in sa so without the movement allowing us to get close and try to grab (and hope it doesnt get resisted) by tyring to confuse the enemy we would just get blasted away with all the huge aoes it seems like most classes have now.

The issue is click to move it changes where people are vs thier animations. They need to remove it.

Just add THICK trails for every movement skill. Simpuru.

Just fyi, you can go invis with a Warrior too lol. You just need good FPS, know how, and godly ping. I'm kind of agreeing with your main point, IF they had done this in the beginning of the MMO and/or the beginning of Succession classes. If they were to do that NOW, it would mean every class needs to be changed and reworked from the ground up. Their engine is quite different from other MMO's, and most Koreans, iirc, WANT classes to be faster. You would have to fundamentally nerf everyone's speed to begin with, and then change the classes to have buffs in other areas. (Depending on the class) i.e. Guardian slow to begin with, wouldn't necessarily need slow nerfs.

They should remove the auto grips, that is broken