Just touching on some of these.

Differentiating friendly and enemy DRG LBs would be enough for me. It's one of the easiest things in the game to counter-play: you see it and you press guard. The only issue with that one is the friend or foe identification. I personally wouldn't mind adding some kind of a visual effect for being under horrid roar.

GCD LB's won't and IMO shouldn't be happening. There's nothing wrong with LBs being used as part of kill combos especially if it's very clear that the LBs whole purpose is a single target delete like MCH's is. I don't know what the point of making a heal-down not stack with Frazzle is when there's more heal downs in the mode (Sole survivor, Mummification) which, as far as I know, all stack. Why the heck would you make those 2 specifically not stack? That said MCH is already strong and giving it an effect that strong would really be pushing it, even with your LB nerf.

Not quite feeling those SAM changes over all. While I'm all for adding better visual cues, Chiten already has rather clear activation animation. If you want to add something lasting to it then make the initial animation just play through out the duration. No need to pull a completely new one. Also the LB is not a line AOE, it's a circle around your target.

I doubt anyone would ever touch WAR or WHM again with those changes. That's not objective tweaking, that's just a straight up butchery. You seem to think they're some kind of untouchable SSS+ tiers. They're not.

I really don't see the point of wanting to make things like DRG LB or SAM Chiten easier to see and then go 180 degrees on BLM LB and claim that it should be harder to see. All that would do is make some bad players not realize that you've LB'd. It wouldn't fool anyone decent and obscuring important information is seriously not a direction I'd want to go either way.