I'm not sure what the issue is. Did most of us want Ben and Bloom to stay longer?
I don't think it's volatile to drive away two guys who led the team to 3 last place finishes in 4 years.
The issue is really about 2 guys and why they left or were fired: Theo and DD. I see no pattern of volatility, here.
Argue that JH & Co. made mistakes in hiring Ben & Bloom, in the first place, if you must, but replacing them was what most Sox fans likely wanted and thought was the right thing to do. One can argue, both were hired to do something many Sox fans don't want to accept, namely rebuild a team, and to some extent, that's what they both did.
Theo wanted more control, and chose to move on, when he was not given it.
DD, in my opinion, was not willing to go along with the "new plan" of a major rebuild, which included a massive tightening of the budget after 2019 and a priority of not trading away anymore top prospects for immediate gains. IMO, had he stayed, it would not have worked out for either party, and he'd probably have left the following year, anyway. Just my take.
To me, the only real similarity in departures was between Ben and Bloom, in terms of their 4 year histories, failure rates and a shift in team plans about to start. However, one was fired and one left when it became known his powers would be greatly diminished. That is a difference, but to me, it doesn't matter much, but it also does not support the claim that JH is volatile, IMO. They both left because they failed. Keeping them could have been viewed as volatile. Dareing a fan and media revolt.