I agree, each trade should be judged on its own merits, but it is not uncommon to think, at the time of the trade, that we gave up a lot, but from an area of strength, so it hurts less. Now, on the Betts trade, after losing him, we did not have "strength in the OF," but Verdugo was meant to lessen the blow of losing Mookie, and his 5 years of control vs 1 was the key. Adding budget space is often a big help, but since it took us 3 years to replace Mookie and half-Price's salaries, I'm not sure it helped all that much.
On the Vaz trade, he was going to be a FA, and we knew we were not re-signing him, due in part to having Wong in the wings and the McGuire addition in the works, at the time.
I have no problem with people seeing the trade as a three team deal:
Vaz to HOU
Diekman to CWS
McGuire, Valdez, Abreu and the Hosmer rental to BOS
(I do think we make the Vaz trade, even if we didn't add McGuire.)