To your defense, you're sharing a truth that is often difficult for many technical founders to hear/read. Many either over-estimate their non-technical skills or don't care to think about them at all, as "the better product always wins" myth remains present to this day. I am not personally exempt from this thinking, especially at the start of my entrepreneurial journey, where I wasted many months bringing products to market, to no avail. I am also certainly not the first person to make this observation.

If you aren't willing to hop on a demo of your product via video chat with a potential customer, per their request, you're directly lessening the chances of that product's success. With that said, once you realize that without marketing or sales, nobody will see your beautiful creation(s), you quickly realize the need for such. Personally, this lead to a desire to learn, practice, and master these skills. However, you can easily find others with a seemingly natural affinity for these skills and delegate these efforts to these individuals (whether partners or employees), enticing them with stock and/or salary should you have sufficient revenue and/or funding.

EDIT: I want to make it clear that I am not suggesting solo ventures succeed less often than those with more than one founder. There is research (see that from NYU and Wharton) pointing to exactly the opposite.