Interesting to see the Celtics fall back a little bit, and now recent rumors that Jaylen Brown is not confident about his future in Boston.
Boston's team paradigm (Tatum-Brown-Smart-Horford) has been persistent for six or so years now, minus a brief Horford departure. Their big shakeup move in adding Kyrie failed spectacularly (as things often do involving Irving post 2016).
Tatum and Brown have improved from where they were circa 2018 but... The team as a whole and their style largely remains the same whether it's Stevens, Udoka, or Mazulla coaching. They have become a successful team and are consistently at the door of a title run, yet I find their unit's ability to meaningfully improve has stagnated and they have been more than beatable throughout all of these years. Part of it is variance because of the outside-outside playstyle of leading scorer Tatum (that playstyle also applies to Booker who I feel similarly about in playoff scenarios).
Horford is getting older and older. Grant Williams is probably out of there this off-season. Robert Williams, while good, is oft injured and limited in some ways. Boston's front court depth will degrade. Tatum at the 4 full time makes some sense, and he has experience there over different seasons and when others are injured/small-ball lineups. Their back court is filled with good-solid players including one that's the heart of the team in Smart, but Marcus still has weaknesses that can be exploited. The rest are eh (minus Jaylen Brown of course, I think of him as a 2-3 wing).
Trading Jaylen makes some sense to break up the monotony Boston has in spades, but there's far from a guarantee that it works out in their favor.
As things stand, Cavs are positioned well against the Celtics for years to come.