The moves are helpful - and if you are going all in, do it for a stud on a great contract in his prime. His delivery screams TJS, but his results don't - and so you have to give Sale the benefit here.
Now the risk is obvious - you are prospect poorer and less equipped to handle some level of deus ex machina. Fortunately the core of the team is young and athletic - and so there should not be the same risks of growing old overnight that there have been in Detroit. It is also interesting that the Red Sox may have moved to a post-development machine era the same season where that approach saved the Cubs. Homegrown, cost controlled stuff is still the right way to build a core - and normally the preference is to keep the guys you think will be stars. (and to be fair to Dombrowski, identifying Devers as a superior option to Moncada is a completely reasonable assessment) Moreover - this will also be a test of how bad the brain drain at Yawkey has been. Are enough of the guys who have built this roster of young talent still around to Dombrowski still has currency to trade, and still has stars to promote.
Hard to dislike the Sale trade even with the significant price. Like the Thornburg trade quite a bit also. The Moreland signing probably won't do much one way or the other.