For people who do the "emotional powerscale",calm down a little..
This is basically a slightly stronger version of DR nonG4 Luffy going at it. Nothing special tbh, you can't expect him to casually outbrawl two chars with ancient Zoan dino strength at the same time, just with hardening and G3, that's not how it goes, they are plenty powerful themselves. It's to be expected that he gets into trouble this way.. He got things like G4, FS and advanced CoA for a reason afterall.
As soon as he steps into action with both those adv Haki types, people will backpaddle pretty fast on this one.
I mean Oda legit simply can't do that, cause otherwise he would just beat them here and there.. We wouldn't have an Ulti scale, no character interaction, no "Yamato who Thunder Bagua's Luffy free" transition.. Simply no fluent plot.
Like Big Mom straight up not killing Chopper and Ussopp (like wth is that?) or Zoro having problems with some random gifters, even though he probably could clear that whole room with like 3 pound cannons. The narrative is more important and Oda dumps down characters if he needs to (on both sides).
Only one up until know who was seriously threatening imo is Apo, no front against him. Dude is legit hax and powerful.
Nonetheless I'm actually quite impressed by Ulti. I wouldn't have thought that her base is this strong (she's freakin female Luffy, in strength and character). She's legit a strong high mid tier.