As I said, the game has slowly painted itself into a design corner.
FIrstly, the time where XP was meaningful has dropped relative to the rest. Expansions last two years, and the time to cap has shrunk steadily to the point where you essentially cap in, what, 25 hours of /played. 30 if you're a filthy casual that takes AFK breaks all the time?
Once you're past that tiny, tiny little window, every single trash mob is null and void. They attack you while you run around? You're not going to stop to fight them if you can run away. It's not that it's dangerous, it's that it is a stupid USELESS delay.
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