The simple reality is Baynes, Rozier, and Morris were replaced in the rotation by Langford, Edwards, G. Williams, and Poirier. That just strikes me as a huge downgrade (at least next year). Now sure maybe long term those guys end up being very solid players, but relying on 4 rookies to play major rotational roles is just not a good idea.
This is yet another offseason where Ainge failed the team.
This only makes sense if you willfully ignore the fact that the team clearly opted to refocus around youth once it became clear that AD wasn't happening and both Kyrie and Horford were gone.
Replacing the players you mentioned with younger guys is totally reasonable in that context.
Baynes and Morris were vets with no future in Boston. Rozier was a net negative. The team is better without them.
Between Brown, Tatum, Hayward, and Langford (a lottery pick), the Celts have no shortage of talented players to fill out the wing rotation. Not to mention Smart, who can play 1-3, and Semi, who should get some minutes at both forward spots.
Smart and Wanamaker should be more than capable of filling out however many minutes at the point the Celts need behind Kemba.
At center, the Celts have three seasoned professionals to divvy up 48 minutes, plus a highly talented yet raw prospect in Robert Williams.
They're not exactly thin at any of these spots.