Why do casual players seem entitled to cosmetic items added in game?

[Absurdity]

4 hours a day is definitely not a casual. I would definitely classify you as a midcore player (and not midcore as a difficulty setting, as a lot of hardcore players like to define it).

That's where we run into problems though, because "casual" has come to mean two completely different things.
You got casual in terms of "time investment" and then casual in terms of "player skill" or I guess "willingness to challenge themselves".

You absolutely have people who, with conviction, consider themselves casual but spend 4-6 hours a day idling around in Limsa/Ul'dah or in one of those "venues", simply because they have never touched anything harder than Alliance Raid.
And then you have people who maybe play 8 hours a week but manage to clear some of the hardest content in the game, who also consider themselves casual.