The challenge there is that tasks like marketing and sales take an immense amount of talent and experience to do well - and they gain very little from software engineering knowledge. Sure, there might be sales tools to help track progress, or marketing may be able to implement the A/B testing themselves, but realistically the real value they bring is outside the scope of engineering software.

The time it cost them to be software engineers is time they wouldn't have spent becoming better at sales/marketing, so your company would be in a disadvantage in the market. Even genius engineers can't overcome bad sales or marketing.