Part of the issue is it's very common in addition to taking 4-5 years to make that it's pretty routine for Pixar/Disney to throw out half or more of a film if it isn't working (and also about every 3-4 years there's a Batgirl situation where they just shelve a film entirely like Pixar's Newt). Katzenberg very aggressively test screened everything during his time at DWA and often that would require large scale reworks of giant chunks of films.
You can go cheap and sometimes it can be a hit like the $30 million NUT JOB, but it has been several years since you can point your finger at something like that, because it's very noticable when you slash budget under 75.