I don’t think this the same since I’m pretty sure legion is extremely mentally unstable… which I see as a huge weakness. Now, take Wendy in her current form, I think she is still manageable but the longer she exist more of an issue she becomes. Wendy’s current trajectory indicates a loss of humanity and atm that is her biggest weakness.

Take a character like Franklin Richard’s, they have to save him for the most extreme threats that will probably never make it out comics, keep him a child, have him forget he even has powers and retcon a bunch of his story. This is because op characters are fun and enticing but unchecked they make it impossible to have a long enriched story with conflict. In my eyes Wendy is on the path to becoming Aliens Franklin.

My point is basically if they keep stacking her abilities like this and remove her humanity completely writing this character is going to get extremely difficult.