I have two major criticisms at newer Shonen battle manga which i wanted to adress.
My problem with the new guard of Shonen manga (BNHA, BC etc.) is that they are just filling out a template that has been used years ago without any innovation. What i always found interesting throughout the years of Shonen and its history is that it always kept evolving. Hokuto no Ken was influeced by Otoko Ippiki and other Manga running in that age, Dragonball was influenced by Hokuto No Ken, Saint Seiya and other manga and took the Action Shonen genre to a new level. Then came One Piece, Naruto, Bleach, HxH, Reborn etc. and used the template Dragonball had but expanded it with either better world building, richer characters, better power scaling, more complex stories or other elements. Now we have the new generation with BnHA, Black Clover and other battle manga running right now and they are just using the template Naruto and other Shonen in the early 2000s formed without innovating it or expanding it in newer directions.
My second problem is that newer manga artist are usually just influenced by other manga and there are not many other sources of inspiration which is different to other eras. Like with Hokuto no Ken f.e you can see that they were influenced by Hollywood movies like Mad Max etc. Dragonball is as everyone knows an adaption of Journey to the West but spins it into a gag series. City Hunter, Cats Eye also clearly influenced by Hollywood. Araki uses music as inspiration for Jojo and there are countless other examples like that. I find it more interesting if you take sources outside your own sphere and bring it back into yours but spin it into something fresh. Shonen manga feels kinda incestious in that regard at the moment.
I had more to say on that second point actually but i have to catch my class. Hopefully it made my point clear though.