From what i know, the reason why grinding is this hard here is because: " Players in other MMO gets to do the same thing ". which does makes sense.
The thing that i find crazy here is you still need to use a total of 1500% exp boosters just to get to a reasonable grinding from level 60 and above and that even using 1500% boost only gives you 0.0x% per kill (or more worse at level 64, 0.01% per kill) and because DV is arranged to where we can kill a lot of mobs at once.
Imagine grinding without any exp boost lol. And from what i heard, it was even slower before EXP chips came out. It's kinda focused too much on how much maximum EXP boost we can attain.