Your first point discusses about the lack of mitigation but then your second post wants to nerf what small terrible mitigation we have?

Because people burst down healers and no one but WHM can defend against that, as a SGE Protect and REcuperate (because of my TINY hp pool) is the only thing that keeps me alive half the time.

I've never heard of this "Ranged is OP" perspective until now. The only op ranged is really RDM because they can shield damage dot etc. People are just talking about it less because less people are at high enough a rank to see the truly good RDM players who basically can't be countered if they're played properly, and people constantly go after WHMs instead of them making them easy to gank.

SAM along has multiple gap closers that also do damage and as someone who literally just had a match with a SAM who had it in for me the whole match, are not underpowered against range in literally any way.

The "ridiculous defensive kit" doesn't even work properly when guard can sometimes take several slams of the button to go off (which could then mean you toggle it off with a second press) and Recuperate is a managed resource pool that you have to keep on top of during the match. I would talk about how it's really STUPID that an enemy can be in your base but because you're full health they can run "through you" to the health pot which I think is broken and needs to be changed, but even that wouldn't stop classes like NIN/SAM/WAR/WHM/RDM.

Your example of a SAM with 4 ranged doesn't have a problem with the kit, it has a problem with the team not helping burst targets or buff the SAM appropriately. Which is a communication problem and/or dumb player problem.

By limiting abilities, getting rid of mitigation, and making everything slower you get rid of the appealing things about the mode compared to Frontlines. Frontlines is a boring slog of a mode that is dependent on RNG and long pvp doesn't mean good PVP. CC is fine as well, you just need Purify to be fixed and stop letting classes like WHM and others have multiple purifies if the rest of the "role" won't get it as well.