I don't understand it at all. There's been a large number of people aggressively attacking new players recently and I don't understand it at all.
People are constantly attacking and harassing people because a few streamers recently have been reskinning their UI into something that makes the game accessible for them.
A lot of players from other games - namely WoW - are used to UIs that are presented significantly differently than XIV's UI. So they have been using mods that change the way the information is presented to them. Nothing else. None of these UI mods give any advantage to them in any way, they just change the visuals to something they are familiar with so that they can actually play the game.
Because this reskinning doesn't give any advantage that isn't already in the game, there's no way it can impact high end gameplay. Even if it did, it doesn't affect anyone that doesn't want to use them. Some person I've never met using a mod doesn't affect how fast I clear a savage tier in the slightest.
Personally I feel that the game's base UI is fantastic and there's no need to change it, however everyone has their own things that make them comfortable and they should be allowed to.
Every single high end player I've talked to or heard opinions from is in favor as well, because it doesn't affect them and increases player population by increasing game accessibility.
It's very well known that the "no 3rd party programs" mentioned in the ToS is primarily used to prevent harassment due to damage meters (I was literally told this day 2 of playing by a stranger) and to prevent lewd mods for lalafells.
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The most important part of this is that a majority of the people using these reskins are all new players, coming from WoW.
And as such, there is a portion of the playerbase that is actively attacking and harassing new players during one of the largest growth rate periods the game has seen in it's history.
This harassment will undoubtedly push new players away from the game, or present the image that XIV has a toxic community (which at this point I have no way to deny - the number of toxic people harassing sprouts and new players out of game has been insane lately)
Pushing new players away from the game and presenting the image of a toxic community that pushes new players away are the two ways to stagnate game growth and kill a game before it's time.
Who would want to play a game where they are hated and harassed the moment they leave character creation? Why do all these toxic casuals want to kill the game?