I understand why people want this but I feel like to many characters are receiving this kind of change. There should be places in her kit that she can be easily punished for.
Mei, thrives in either 1v1 environments or when she either sets up her team to follow up on her actions or relies on her team to bail her out in situations where she is forced to cryo.
Cryo needs to stay as it is in my opinion because she needs to be punished if no help comes her way and she has overextended herself. Adding an auto reload in cryo heavily reduces risk on an already well designed kit for stalling and escape.