Its not unlimited flying. Its gliding, there is a big difference. Just gotta nerf that fun, Perhaps they should have gated it too. I mean, its how they can make sure you're having fun at the right pace.
They just dont want you negating some of the things they designed to slow you down. Instead of focusing on buffing locks or all the other broken classes they first and foremost focus on nerfing the fun. I was really having a good time gliding around, made it more bearable until flight comes.
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They are just scapegoating, say goodbye to all the fun mobility toys and say hello to using Demon Hunters and Engineers as an excuse to nerf them.