I’ve said since the Primaris Marines debuted that I felt GW mishandled their release. In my opinion, they should have simply introduced the new sculpts and said out with the old sculpts... But kept the classic squad structure. Basically, instead of Intercessor Squads, just made Tactical Squads out of Primaris models. (Along with rules changes like better boltguns and two Wounds.)
Then put out a magazine article, a blog post, and a YouTube video that basically said “Look, we haven’t had a fundamental redesign of the Space Marines since we phased out the Beakies in 1992. They had a good run, but it’s been thirty years. The new models are bigger, better looking, and we hope you like them.”
But that’s not what they did.