It's simple numbers. There are far more players that prefer the game to be easy so they can relax while playing, get their loot, and feel like they accomplished something. It's a very small percent of players that like to bang their heads against difficult encounters for weeks or even months before being able to beat it. Most people don't find being frustrated fun. These companies are going to follow the money.

And woe to FFXIV if it follows Wows path. Peaking at 12 million subscribers and maintaining 5+ million for almost a decade. That would just be a terrible fate for this game. Clearly nobody wants easy content.