Previously I rarely used airthrows as 4A+B~A felt much safer than doing PO rush and it was easier/more damaging to follow up with A+B FC A+B 4KKK than doing B+K B+G/214 PO 8B+G (I only managed to do it reliably on bigger opponents). The damage might be too much but that PO rush isn't anything bulletproof if the bomb gets blocked (stepping, blocking for big punishment, interrupting - all are possible). I'll admit that I'm not an expert how that situation tends to turn out in most matchups. However. Since the A+B followup combo no longer works I think it hurts her bombs as well because for doing damage after it you'll have to do the PO rush which I find being a guessing game that does not favor either player. Previously blocked bomb canceled into A was just 100% safe on block. If 45% combodamage (does it even do that much?) is too much compared to it's safety... I don't know. As other stuff takes some hits in this patch I'm glad that the fear for 4A+B still exists there.- Bomb+skydrop should do less damage. (down to 33% from 45%)
I like the changes to FC A+B at the moment. Just the last week I started discovering how powerful tool it actually is outside combos and the stun removal seems justified (considering how strong it felt after just few nights of using it more actively instead of just using it in combos after 3KKK). Only issue is that is there any reason to use that move now? It might work as a safe CH fishing tool but I haven't tried what kind of combos it gives on CH. Range or tracking might be big issue as well.
I understand the patch notes so that 6A+B CH no longer works as a combostarter unless only the second hit lands as a CH and in those cases the A:6 continuation would work. Not sure if the combo works if one starts it with some other move like HOV B or any other move that led to the 6A+B~4 A:6 3KKK... combo. Hope it still works like that because then the nerf would only be in place to prevent rather op CH combo fishing with 6A+B that is pretty safe thanks to PO BE which was easily the best way (with guard impacts) to use meter. Not like PO A, PO K or PO B+K (or maybe HOV too but I never really used it that much) weren't decent tools for avoiding punishment either. Now 6A+B 4 only gives nice position for Possession.
To make this all stay on topic... In short it is just too early to say if Natsu even is too weak after all the nerfs. She lost some cheesy stuff but the notes are bit vague on how badly her combogame takes damage. Might take more effort to deliver big damage but she still seems viable to me.
If there is something I'm worried it is her non-existend mixup game. 4A can work to some extend but without meter for PO BE it is just setuping yourself up for punishment. 2K would seem good candidate for buffing as it is not too fast nor does contain any evasive properties so if it was better on hit wouldn't make it completely broken. -6 is just bad even if 2KK is NCC. -2 might work keeping Natsu's i10 moves in mind. +0 or any advantage might be too much considering generally lows are negative on hit.