This is a game of numbers and probability.
There will always be a best comp, a best job for some scenario, a best skill, a best everything.
We cannot stop this. Nor should we try to, we should accept the game for what it is.
That said, what we should strive for is a situation where the gap is small enough so it's not this glaring.
In 3.X I played a lot of BLM and SMN. I knew BLM didn't have as much single target as MNK, but it was close enough that it didn't bother me.
I knew that BRD+MCH+NIN+DRG was better than having a caster there, but I felt good playing SMN and melting adds in A12S.
Right now though, I feel worthless playing either job. I play them because I adore them, but it nags me on the back of my mind- "these guys would be better off with a samurai/ninja/whatever...".
I just enjoy the aesthetics/feel of the caster jobs, and dislike Samurai or Ninja. But- I suspect like most people- I have this power fantasy. Everyone likes doing lots of damage, or buffing the whole party- one of the best feelings I've had in this game was negating a mechanic with a deployed Critlo. And it's hard to feel that when I know some jobs inherently do more than mine no matter what I do, in damage and utility.
Maybe I'm salty and selfish. I probably am. Maybe I shouldn't think about these things and just "enjoy the game". But I really feel like I'm a poor choice for a group, and it's hard to shake that off for me. That a player with the same skill playing those jobs brings more. I can't rationalise a reason to pick myself with this job choice over that other guy with a RDM. I even started prepping RDM to escape this feeling. I never felt like this in 3.X. I don't want anything nerfed, or the meta to change.
Just a little push so I don't feel as bad. Heck, you could give me 2 potency and I'd instantly feel better, going "aaay, at least I'm a bit stronger now".
I'm aware this probably sounds awfully petty/silly, but it really is how I see it :/