here's my take - the hardest part isn't doing more computer programming, it is context switching between technical and sales. It has been done, so it is possible, but it is very difficult as people said.

very few computer programmers have good business insight. we know how to build cool stuff, but most of the cool stuff are either - unable to directly bring values to people or cool but no one cares. that's why we need a cofounder, ideally, a person closer to product/sales, who can help you to make connection, understand what people want, shapes product... all the non computer programming stuff.

also - we tend to work in isolation when being the only founder. at least for myself, i sometimes live in my own head, which can be very far from reality...

despite that - i share the same sentiment with you and will not give up trying to found a business :)