I am saying both have their places, some apps would be a way over kill to implement event based system instead of simple crud. I found it out first hand in redux. When I had to first define an event, define a listener, define event trigger function... 3x boilerplate already, then find special tooling to keep track and debug of N^n events firing, then literally read every event listener code to figure total sequence of events occurring if user clicks something vs sequential code in the same file. I found redux wasn't worth it. Pub/sub systems have a place but it's not where MVC model fits.