You're entitled to your opinion but I don't agree with you.
All content should have rewards. Cosmetics are a great way to add rewards to content without making the activity mandatory for character progression.
It's actually you who has no reasoning to back their argument. It's literally just a case of "I want the rewards but I don't want to do the content therefore the reward should not be locked behind the content", i.e. entitlement.
"We aren't entitled, we just want this kind of reward with a low barrier that everyone could achieve while essentially afk (if it was mailed, we wouldn't mind), even though it's also available on the MB, but we can't be bothered with that either, we are paying customers after all". Yeah, it's entitlement.
I feel like the problem some people here have, is that the word "entitlement" is used across the pond to shut down every legitimate demand for bettering society. Or when people even are legitimate entitled to certain things by law / contract. However, this is an MMORPG, and a significant appeal of that genre has always been that activities come with rewards, especially customization options. On the one hand, to have goals for players, on the other hand, to brag. I mean, that is why YOU want to have the rewards as well, right? To show them off. To present your character. You don't even understand how required such a reward structure is for a game to exist in the first place. There are other games that throw gear and customization and all that around for free, and they are all in the same corner of "dead MMOs", barely coasting by on life support with no real investment.
I can understand the argument from both sides. The game is old, and character customization is very limited and straight up ancient compared to its competitors, so putting a hairstyle, which changes your character appearance, behind some hardcore content, is understandably upsetting, but at the same time, SE is creating a bigger rift between players with petty bickering because they're unable to provide good and satisfactory rewards for any type of content, as usually the reward is a single (1) item of some uniqueness. Eventually more things will be shoved into the mogstation shop, outnumbering shop items by number of rewards in game.
Folks are all up in arms over a hairstyle that isn't even that attractive. I wouldn't spend two gil on it, let alone 20 million.