I mostly liked Nami's Whole Cake Island outfit. She changes her clothing every arc, however, so even if her original post time skip outfit is quite bad it'll be relagated to openings soon enough. I feel like Robin was hugely downgraded, her face looks much less unique than she did before the time skip.
Going back to the shonen manga discussion, I think cosmicblizzard missed a point about the subgenre manga. An average shonen battle manga uses fights for visual spectacle and to artificially extend an arc length. An actually well written shonen battle manga uses its fights as a way to bring character growth and move the story forward. One Piece is a flawed series in a lot of senses and I surely don't hold him as some sort of genius, but it sure knows how to make its battles meaningful in a much bigger way than just the visual espectacle. In 10 years, I will probably not remember a thing about most fights in MHA*, but I can still visualize some of the best moments of early One Piece as if I had the panel in front of my face.
The fact that most people remember fights like Haku and Zabuza vs Team 7, Rock Lee vs Gaara and the first Naruto vs Sasuke much better than most fights in Shippuden tells it all, really.
*Actually, I think in 10 years I'll still be salty about Uraraka losing against the I'll blow up until I kill you guy in the Tournament Arc.