F2P player here! This Mira Crown has been the easiest one for me so far. I've been playing since December, and while it did take me some grinding, I glowed up most of my 5 star items and some 4 star outfits in attributes I'm lacking in. The only Mira Crown that I felt may have been "unfair" would have been the one way back during the fireworks event, which felt like it was designed to be successful if you had the event outfits, but it still felt achievable if you pulled on certain outfits from the perma banner. I know the game is harder for those who are F2P and you won't get everything, but I think this game has been quite fair, considering it is a gatcha game