Tbh man, I don't even know. My body's relatively proportional (legs really aren't that long for my height [36-37" inseam]) except for having slightly slimmer shoulders so I feel like I should be able to bring my bench up quite a bit now that I'm able to train it consistently (was injured).
Also, for a while I didn't really care about upper body and just trained legs/back because they were "easy". However, I started 5/3/1 4 months ago and I've seen great progress in bench. For me it's really just a matter of eating enough calories and protein to allow my body the fuel to repair itself. Learning proper bench technique helped immensely as well.