There would be no need to deliver new mathematical insights by solving problems. You would just have a magical math problem solving machine and that’s it.
To further human understanding is itself a goal that single-handedly justifies our efforts.
Jumping straight to the “answer” and therefore missing both the understanding of the actual problem, and any useful discoveries along the way is a waste at best, and actively harmful at worst.
Someone in the thread mentioned Minkowski’s math work being instrumental to Einstein’s physics. If Einstein had had a math machine that can spit out the result at will, he wouldn't have needed Minkowski.
Nevertheless, I also see the opposing point: if Minkowski hadn't already published his results, it's possible Einstein would not have even had the inspiration to derive general relativity from it. I think this is the human aspect most critics are worried about.