We know the answer to this even before modern tech businesses existed: running a business is a very different experience from what people expect. This is exacerbated with certain experiences that create worldviews which are closer to the opposite of running a business.

This is why startup people straight out of school are often unencumbered with ideas that impact their mission. If you go into a large organization, you are exposed to a reality that can distort your perspective. It's a myth that people can't move between large and small organizations, but the differentiator is their awareness of and desire to embrace the current circumstances. Many end up preferring the luxury and ease of large organizations and fail because they don't make the switch. Many startup people don't make the move in the other direction (even if they are exceedingly successful and it might be practical move.)

Similarly, a desire to only focus on engineering is something you feel will inhibit your ability to run a business. Over time you might be able to discover ways to reduce your hate for the other work. People here love to prescribe advice for situations like this, but it's really hard to give good advice without knowing a lot more about you.