I need help understanding CC/PvP in FF14

[Valence]

Question 1
When going for potions on the map, why is it the 5th person behind me that gets the heal? How to fix this? How is it fair to where on MY screen? MY GAME! I am the first one on top of it, AND/OR Dead on it!
This is the same for the one map in CC with the tornados and the chocobo buffs! WHY Is it that I am the only one chasing it, then anyone waddles in, and it's the person on the damn spawn point that gets it?!

Because on their screen they're the first one on top of it, and to the server they probably were slightly ahead of you, but due to how poorly positioning is updated in real time in this game, it just leads to frustrating experiences such as yours here. It is also frustrating for me when it happens.
As a rule though, if you see someone running just next to you to get something, or even slightly back, odds are they're actually ahead, even if you don't have latency (it can still involve significant amounts of delay).

Question 2
Who thinks 1 button, 1 shots are a good thing? I really want to know.
How is NIN, insta-kill, a good thing? It's a full animation stun, into an instant death.
And you ONLY need to be 50% health. You DO know, a ninja can simply Assassinate > Hyosho, and you are already at 50% right? This is only 1 job, with 2 abilities. Let's not forget there are 4 other team members. The way I see it is... As soon as you hit recuperate once, you've already lost VS Ninja LB.

LBing someone at lower than 50% HP while they still have MP left and are in full possession of their character agency (no stun etc), is a gamble on NIN since sometimes they'll just recuperate or get healed when you press the button and you'll just waste it. The higher ranked, the more reactive people are with this. Play Ninja and you'll see that it's not that insta win as it may seem. It's just gamba, quite frankly, unless you play it ultra safe and only go for safe targets (no MP left, crowd controlled, etc).
However I do think it's the lamest LB of all. I like the idea of a LB one can chain one target to another under specific circumstances, but I do think the current requirement isn't healthy, good or fun.

Question 3
When I play...

WAR/DRK/MNK/MCH

WAR LB Shout - I only ever hit 1 person, when there are 3 people grouped on point?

DRK Salted Earth - I can never get the follow up root to happen unless the person on the other end is sleeping at the wheel.

MNK/MCH - Knock back. Why are they always flying to the opposite side if where I am aiming? Why am I never able to push them in a bad location? I find it unfair to me, the paying customer that I am seeing my enemy in front of me, ready to use my skill to put them into a bad position, yet they just are blown behind me and to safety?

There are 100 more questions, but I'm going to start with these. I really hope, I get answers to my questions and not simply trolls with the 'git gud' responses. I have been desperately trying to understand and get better, but these little things make me want to never grind to crystal rank ever again, every queue was a slog, depressing, and a job I hated.

It sounds to me you have a LOT of latency if anything. But yes it happens because of the reasons explained in #question 1. Positioning in this game is BAD, and you'll have the same problem in pve as well, its just less directly problematic.

[ShiyuuHQ]

Thank you all for the information, and input.

I will strive to be better, I will aim to adjust, I will work around it all.

I will balance it from all this info. It's better than I received in discords.