I disagree with this.
While addons can be beneficial, they aren’t a necessity in playing the game and the game is perfectly fully functional without them. I have played the game a number of times without any addons at all and did just fine. They are a convenience. I know many healers have always used healing addons as an example. I haven’t ever used a healing addon in my almost 14 years playing this game and I was one of our best raid healers back in Vanilla.
So again, while they can be beneficial, even some are fun, they aren’t a necessity, although I’m sure some people feel they are.