Myth was initially made hard to get after it was uncapped, they did some updates to myth drops at 2.25 that made myth more common.

There seems to be a misunderatanding. You can stock up 2k myth, and 2 soldier and buy 2500 soldiers worth of items right away. You can't convert anything to the new tombstone so no one gets to start with more of the new gear then anyone esle. Everyone starts at 0. I have blm at i110, war at i101, and drg at i100. So soldiers on the first day doesn't brake anything, especially since it becomes farmable. In fact it will help the current players who choose to try ninja, which is already gimped in the fact you can't prebuy the books for it and you still have to light farm for nexus, ntm the next stage of the weapon