[magicalhippo]

Finding good solutions often require simultaneously considering both the business side and the programming side.

The business-only guy won't see the limitations and possibilities of code, while the programming-only guy won't see where the business side is flexible or where it is rigid, thus the optimal solutions can take a long time to find.

The business side might also be prone to specifying X-Y problems, which can be very difficult to spot if you're not into the business side.

At least in my experience, having significant domain experience in our dev department has been a super power of sorts, allowing us to punch well above our weight.

edit: I didn't have any domain knowledge when I started, but I was willing to learn.