I think it's easy to overstate the acrimony. This sounds like standard stuff to me just hyped up in emails (just speaking from personal experience, gripes in corporate emails tend to over-emphasize the reality). Obviously not everybody on a project of this size gets along. There's more enthusiasm and positive commentary as there is negativity, and sometimes it appears the negativity stems from folks not being on the same page (there's a note from Sam Mendes to Amy Pascal explaining that the October draft was completed just to get the budget/schedule in order, and that the third act wasn't finished when it was submitted for their perusal).
I honestly think this stuff is more business as usual than folks are making it out to be. There was a moment where development on Bond 24 wasn't going smoothly (seemingly early May 2014, when Logan and Mendes delivered a long-delayed rewrite and the major parties agreed that it was inferior to the previous drafts), but I don't see much evidence of dramatic infighting beyond that. If you look at the behind-the-scenes material on the other Sony products, you get the vibe that this is just how things go in the movie business.
Yes very reasonable although I think you are slightly overstating how "business as usual" it is to be rewriting key confrontations between Bond and Blofeld days before shooting. That is not ideal. Usually scripts *are* locked down earlier than this. I'm not sure about the exact timings, but weren't Mendes and Logan working for like a year and still ended up with a script that was considered very flawed? Again, not smooth sailing and although it does happen, many films come together easier than this. Doesn't Pascal say at one point pretty late in the day "there is something wrong with this movie, it doesn't want to come together!" or words to that effect?
The script I read had a key poker scene, dated 1st December. Shooting started 8th December. That scene was completely thrown out and reworked days before or during shooting.
Contrast that with the Steve Jobs script, which everyone loved months in advance of shooting. All I'm saying is their attempts to "fix the third act" days or weeks before shooting, and a final film with a weak third act... tends to suggest those problems weren't resolved.
Incidentally, I mostly loved the film.