I honestly don't consider the people that afk on limsa everyday and feel entitled to every single reward with barebones participation are casuals.
Exactly how these two things are even related or coexist in any form is yet to be proven.

Casual players are people that don't give a lot of hours to the game and that don't engage in a lot of endgame activities like savage or ultimate
Endgame is whatever we want it to be...FF 14 isnt raid or die, nor is it in anyway raid reliant or dependant, your determination of 'worth" based on who raids is basically...idiotic.

not players that stay subbed and online everyday but have zero interest in any gameplay or learning curve
What gameplay in specific?

Without third party tools you actually have NOTHING to tell you if you are doing it right or wrong, if you are being able to do a good amount of damage or not, so many people do not even realize they are terrible.
The game is playable and clearable without third party tools...your reliance on these is a YOU problem.