You can build a fairly successful startup with little to no engineering.
Sure, engineers are usually pretty important (they're great at automating tasks to improve efficeincy)... but so are many other roles.
Best engineers making the best product ever will not make a dollar without good sales people and marketing and product managers and VC and ... You need ALL of these to make a succesful company.
I think it's especially hard to appreciate sales+marketing since they seem so ephemeral while tech is concrete. Sadly there also also too many examples of marketing getting too far ahead of the product, over promising, or devaluing engineering.
Best is definitely a balance, where all sides respect others' work and can see both the effort and its benefits.
It's more difficult to assess and measure soft skills that you would find in sales positions.