Are you my doppelganger? This is exactly my experience on XI. I was a PUP 75 with all 3 nation flags.
I'd make my own parties, as I usually do on XI. And things get done in a timely manner.
I didn't even have a LS on XI. I was a truly solo player (by this I mean I grouped with strangers when things needed to be done, but I didn't rely on a LS to do me any favors).
People who can't get a group going are just lazy tbh. I'd get groups going for anything even on XIV before the server merge. I never was unable to do something because of lack of people here or there.
But anyway, I agree 100% with this guy.
And no, it has nothing to do with luck. You get things done if you actually try. On XI you'd just copy paste the invite and send it to everyone who wasn't in a party an within level range. Also macro'd a party shout macro and run up and down through all of jeuno.