All of these changes are being made to address the changing landscape of manga, namely the fact that paper magazine circulation is falling while digital consumption is on the rise.
During the interview, Nakano explained how this change has caused a pretty significant shift in how manga get popular. In general, manga take much longer to catch on nowadays than before, as fewer people are reading the magazines and are only picking up the collected volumes as they release a couple of months after the initial magazine printing.
Yet, these changes also bring with them new audiences. Hiroyuki Nakano brought up Kimetsu no Yaiba during the interview as an example of a series that took a while to catch on, but when it did, brought in a whole new audience of people who don’t usually read Jump.