The only shade for me on PES 2021 being only an update from the PES 2020 is the price, although I'm moving to play it on PC now so there will probably be free versions like the bypass on the lite version and something like that.
But to talk about all the critique over the 3 years of development and everything like that, I believe that with all the problems that the covid-19 caused around the world, the progress of many things had to be paused. The new gen of consoles and new engines got delayed as well as the development and release of many games, movies, series and a whole lot of other things. What I mean by saying all this is that I'm fine with the wait until the 2022 version comes up with a whole new level of changes because everything else will only be released next year as well. And to compare it with FIFA for example, they aren't changing all that much either in their 2021 version, the only difference is that they didn't said it was going to be an update like Konami did, but that's another topic so nvm.