The debate about the necessity of GPU support brackets to deal with GPU "sag" is very common. It's understandable, given not only how expensive mid-to-high-end graphics cards can be, but also how large they're getting with each iteration. That size increase naturally leads to a weight increase, which leads to the dreaded sag problem that has PC builders fearing the worst-case scenario.
https://screenrant.com/gpu-graphics-card-support-brackets-explained-do-you-need/