I do tend to agree with this thinking.
With Cherington, I always felt he was great at laying the foundation (a foundation that, whether people admit it or not, Dombrowski was able to benefit from and build upon) but couldn't or wouldn't do what was necessary to put us over the top and back into legitimate title contention. Maybe he would have done that eventually, and maybe not. Given the way things went over his last couple of years here, I had no issues with him being removed when he was, and haven't spent any time since wishing he was back. Nonetheless, he brought us a championship, and 2013 can never be taken away from him, any more than 2018 can from Dombrowski.
I have disagreed with some of DD's moves, but I don't know which could be characterized as a "terrible mistake" knowing that they ultimately led to a championship. Maybe the Price contract takes a turn for the worse, or maybe Moncada or Kopech or Allen or Espinoza turn into stars with their new clubs, but at the end of the day, it's hard to imagine taking any of those decisions back knowing what the end result was. Delivering a title comes with a lot of goodwill and benefit of the doubt in my book...Cherington squandered his pretty quickly after 2013, but hopefully the same won't be true for Dombrowski. As I think Notin said earlier, what happens in 2020 and beyond might be the true test of DD's mettle, but he's more than earned my trust at this point, and I look forward to seeing what he has up his sleeve going forward.