Why neuvillette is so bad now? He is as good as Ayaka or worse against some mobs now

How much Mavuika weapon improve over mailedflower R5? I think I’ll skip skirk weapon because my skirk is already strong enough for difficulty 5 in the new game mode but not my Mavuika I’m on guaranteed on the weapon banner

I bought welkin again this is the first time I buy welkin this year. Losing the 50/50 on skirk and her weapon and wanting Mavuika weapon made me do this I probably can’t get skirk weapon but maybe Mavuika weapon oh well

Skirk is for futa Loom.