i don't see many ''uniquess'' in Daisy's abilities though.
I mean at least they could do something interesting and unique with Rosalina and Bowser Jr.
Rosalina is known for her powers , always floating and being able to manipulate things at will with and without her wand and without hands.
There's also the whole Luma thing that easily made her had a gimmick.
Add to it that Rosalina is very popular and was always interesting since the beggining.
She clearly was one of the better choices from Mario to have the potential to be a fighter , and we can see that it worked.
Same with Bowser Jr. They took the clown car , something that he uses frequently to make something interesting with him and it worked.
Daisy realistically speaking , relies on abilities based on Peach's .
Peach gets the Heart ball in the Baseball games , meanwhile Daisy gets the same just with Flowers instead of Hearts for example.
In World Tour, when Peach Wins she spins and gets her long dress back. Guess who does the exact same thing...
There's nothing very unique about the whole flower thing as besides being similar to Peach's hearts , Daisy cannot do anything at all besides that
Unlike Peach , who can Float at will for example.
I don't see much uniqueness in Daisy whatsoever besides her face and her voice. Pretty much everything else she had is either a variation of Peach or something completely forgotten that has never been referenced again , like her Crystal abilities in Strikers Charged.
Daisy was not the best choice to add in Smash based on all of this , no matter how many times she has been playable or how many times she has appeared.
By that Logic then Toad should also get in , and Koopa Troopa and many others that have existed even before Daisy did.