To be fair, I do think Stormblood Selene did need to be reworked. Eos offered extra free healing, mitigation, and increased HP recovered to party members. Selene offered a single target silence (delayed because of pet AI, so good luck actually getting that to come out on time in the incredibly rare circumstances where silencing matters), AoE Esuna, which as nice as that sounds, I think we have more healers in the game than we have fights that even have multiple debuffs to remove across the party, and a party-wide attack speed buff that equated to about a 1% DPS increase in a game that both curb stomps healing anytime more damage is an alternative and at the same time, loathes having unplanned for attack speed increases.

Flat out removing Selene's toolkit is the literal worst way you could realistically address this issue, and that's not hyperbole, but reworking her to actually feel like a balanced choice to Eos was something that was needed.