The fact is that he (at this point I think also a lot of people) underestimate this feat also because katakuri use a bean and not a bullet. Pointing out that a bean used as a bullet maybe has even less killing power than a real bullet. That's why it's almost pointed out it is a "bean" while the story already confirmed that unconvential weapons are still valid to even kill someone. Also it's Katakuri we're talking about with super human strength. He can even use coins as bullets probably.
We're in a world where people use ropes and bamboo sticks as weapons. Why can't beans can't used as projectiles and still be valid as weapons in a world like this?
We're in a world where people use ropes and bamboo sticks as weapons. Why can't beans can't used as projectiles and still be valid as weapons in a world like this?

That bean no doubted travelled at the speed of a bullet, it just wasn't fast enough.
Whole Cake Island was actually the first time we got a power creep for Sanji since the timeskip, but dodging bullets wasn't a part of that. He could do that pres-skip, and then some.
Post-skip, he can't even be got by snipers when he's goofing off.



