I did not actually plan on complaining on the forums here (blame Mentos), but after having a chat with the top players on discord it seems my opinion about the Frosty nerf is common - it is an unnecessary nerf, for a very fun to use variant that's already underused as it is.
Armor break does in no way compare to disabling enemy special moves and tag ins. It's objectively worse considering that Frosty has low damage, and relies on bleed as DPS. As she was before she was perfect, not overpowerd, but she had her niche that she almost ruled over.
Now she has two jobs - half control, half attacker and she is bad at both of them. Truly she is now the Bad Ms. Frosty (Credits to Potomiru for this line)
Disabling just the block busters does not give the player control over the fight, which renders the "control" invalid. And armor break is useless for Filia, since as mentioned before she does not have high attack value, relied on bleed which already counters armor, and if the enemy can't use blockbusters, special moves, nor tag in, you probably do not care if they have armor or not.
Some players did raise a point that Frosty needed something to differentiate her from No Egrets, and to that I would like to reply she already had something like this - ability to control by just doing her combos. But if we really need them to be completely different, give the armor break to NE who actually has any use of this ability, and damage to deal.
So, I would like to ask, in the name of discord players, not to kill our favorite Filia, we've already killed one variant with the last rework, and unusable characters are no fun and do not belong in the game. Of course even if would drop to being the worst Filia, she is still a Filia and as such she is always usable, but why would you use Frosty when any other Filia does everything better than her?
Also do keep in mind that all the players who invested in Frosty move sets end up with a set of useless moves, as Frosty benefits from different stats than most Filia's.
Thanks for listening, and sorry I will not elaborate on the other changes in the patch notes due to the post already being fairly lengthy, but I am very happy with pretty much everything else in this update.