Not sure if you can blame the Supernovas for that, it's more that Oda nowadays wants to focus more and more on Worldbuilding these days instead of characters he focused on for decades now , it's like when a band decides to try a new genre after doing a certain style for decades
Till some point it's entertaining then one loses interest if overused.
"..instead of characters he focused on for decades ..."
Emm I don't think anyone has a problem with it after all the success of preTS was due them.
I started reading OP with a decent group(10 years ago) of friends and now they no longer care due this aspect.
