This is actually not a unique FFXIV phenomenon. I think every MMO ever probably had groups of players with the attitude "what are you talking about? It will always be like this! Things are perfect. They are never going to change!" but the difference is in other MMOs those have typically been players who socially exploit some clear unbalance in game design such as the example of guilds monopolizing world bosses or open world dungeons. It's perfect because they gated others from doing it no matter how unbalanced. Age old thing.

In MMO this comes down to "having friends" and in the case of FFXIV which is arguably a more accessible game contentwise than the old sandboxy types of MMOs where factions of players could "monopolize" content but also still a more collectivist and group dependent game than WoW (it's not just raids but for example treasure map dungeons and other things were you easily miss out on content if you don't have the friends) and more than anything FFXIV does not do much to make the individual player attractive to the collective through sheer individual effort alone, which is a borderline/pseudo sandbox heritage a game such as WoW has more or less managed to do away with over the years.

This is why those who are socially established, be it casual or hardcore, are much less inclined to see the benefits of change.