Many don't want things easier
Did you not read what me and SaitoSenpai just posted? Getting rid of the break system only makes things a tiny bit better. It isn't a big, if any, impact on the fact that getting to +15 is going to take a LOT of time, a LOT of Upgrade Stones, and a LOT of luck. Everyone needs to look at the big picture here: DBO's RNG system is the biggest pain the game has to offer, and DBOG can only do so much with it. If they wanted to make upgrading easy, they would make it to where each level is a guaranteed Success. That's the best they can do, and it's not going to happen.
So again, break or not upgrading is going to be one of the biggest pains this game has to offer. Keeping break just makes upgrading completely unfair for the player so it's best to get rid of it so people won't rage quit and throw their keyboards into their monitors.