No, this is your entire deduction.

I want to have them more challenging so that hopefully I can enjoy leveling. I'm ok if they manage to make leveling fun, but it's not now and having mobs challenging makes it a bit more fun considering that you spend 90% of time against useless boring trashes.

Yeah, make it faster if you can't manage to make it more enjoyable. Why on earth should I even spend 50-60 same time as 1-50 if it's extremely boring? What's the purpose of keeping me bored in a game, shouldn't you make it more interesting to keep me subscribed and get my money? I mean, it's counter-productive even economically. And by reading the topic I AM NOT the only one thinking that leveling is boring.

I'm ok with slower leveling if it's enjoyable, but it's not.
Stop infer what you want from people, I just want to have fun, and looks like it's impossible for ~40 hours (maybe more, I don't know how much it takes to get to max level)