KMST 1.2.483 - Zero (2)

They start at Level 100! Any "slow progress" is easily made up by the fact that you skip the first 100 levels in the game.

I'll pass on that one. They start at 100, which doesnt surmount to the pain of being in the mirror world. There are a lot of people who dont go past level 150 or 170 because training is painful as it is already. Even in GMS, with bosses (that at least give some exp even with the reduction per level), and stronghold and golems, people still dont go fast or give up halfway. Now lets put everyone into a pq where they can't do bossing for exp, pqs for exp, training for exp. Its all mirror world for exp until level 180. I consider that a painful process.
There are very few people who will be able to actively utilize the progression of a Zero character.