It's our recommended setting. We, have conducted many experiments. I also have conducted experiments with my dummy account and it's fine. Regarding frozen or not, my dummy account had frozen long time ago, but since I updated all my data, it's fine. Right now Arknights dev is focusing with creating new chapters and events (or maybe new app ver, with new system). And amount of modders have reduced (Because they afraid). I think the people who got frozen are they who abused the game with underleveled OPs, unlimited skill points and ridiculous DMGDEF.