>>543189872
You yourself state it.
>Tails can do what Sonic does and more since the moment they met. Amy had to work her butt off to reach the same level of capability.
>Amy is like the living embodiment of Sonic's own Heart, while Tails constantly suffered from a lack of self-confidence and inner strength.
>Tails and Amy directly parallel each other the same way Sonic and Blaze do. They exist in balance with one another, and Sonic is what draws the two together. But >Sonic aside, Tails and Amy are likely to get along very well yet inversely likely to not gel well at all at the same time.
>Tails and Amy are inherently "Cute" and nice at their core. But with Tails being very analytical while Amy is very emotional, they are heavily likely to clash a lot.
You might not want to 'literally vault' Cream but you've definitely articulated that her presence takes away from Amy being 'cute in the past and don't want her to be a core member of the cast like she is as of Dream Team and would rather have Blaze be relevant instead of Cream despite Cream's superior popularity and kawaii factor.