Back to BA, being published by Yostar 1 could expect certain degree of generosity when it comes to collecting your waifus. It's very F2P, never felt the need to rush or spend (though I did bought the ¥120 pack but that's about it). Soundtrack, c'est parfait. Story line, the polar opposite of GFL so that helps to balance it up.
However, not a fan of PriConne gacha system. Would have loved to be the same system in AL.
Reroll, just unlink the email & u're done. Unless u want to keep multiple accounts than yea, methods shared by others.