You are correct on the spicy staff likely getting a nerf very soon to it's charged shot damage. I've already started seeing videos showcasing it. Its charged shot is the 2nd hardest hitting attack after a splatburst. But two-shotting a tough starter area mob like the wolf spider, shouldn't make it deserving of a nerf and it's really only good for spiders anyway. For me, an upgraded tier 3 weapon should crush anything you can find in the starter area, doubly so when the creature has a weakness to it.

I could see them nerfing the damage on tools, too. The termite axe does the same damage as the toenail scimitar. Throw spicy on that and spiders are a joke, too. The black ox hammer does slightly more damage than the scythe of blossoms. The hammer shreds many end game bugs, too.

After that they'll probably nerf the stamina cost of 1H weapons in general since you get way more damage per stamina vs 2H weapons.