First of all, I think we need to put the notion to rest that a "retool" has to be something inherintly negative, or only take place because something failed. It often happens when people behind the scenes change, want to put their personal spin on it, or simply think another approach would work better.
"Thor: Ragnarok" was a BIG retool of the "Thor" franchise, after "Thor

ark World" before was more of a refinement of the formula. The same way "Captain America: The Winter Soldier" was a bit retool after the first Captain America, wheras "CA:Civil War" continued on the path of "Winter Soldier". None of these franchise were anywhere close to failing when these happened.
As such, it's undeniable that what happened at the end of season 2 was a
major retooling of the series. Bigger than any other retooling any previous Trek series ever had. That's not a judgement, that's just a neutral observation.
Where the personal judgement comes in is -
I didn't like the way they did it. It was overly on-the-nose, and felt both very forced and rushed at the same time. And I don't see how it will improve the show, compared to the smaller refinements that happened over the course of season 2
, which
did improve my personal enjoyment of the show.
But that being said - I also didn't like the way the Enterprise was introduced/shoved in in the final minutes at the end of season 1, and felt that was more distracting/taking away from the show itself. But then very much enjoyed how they actually
did handle the whole thing over the course of season 2.
What I'm saying is, I'll try to keep an open mind. But season 2 will have to try to convince me personally to watch it completely anew, whereas if they had
stayed in their version of the 23rd century, I would have stayed as a fan of the show as established over the course of season 2.