(In fact I am currently playing with Mint 2* (Evolved and Maxed) to farm Tickets for her. I have also many 3* Girls Evolved (Level 60), with 4 Equipment slots they are not really weaker than a 4* with only 1 or 2 Equipment slots, they helped me a lot and don't regret the investment, especially if you lack of a specific Archetype (like me in the beginning with zero 4+* Pierce).

)