Agreed. Managing, fundraising, legal, roadmaps, payroll, hiring, sales, marketing, customer support etc. If you're a coder running a company, it's likely you might not get to code at all, or ever again if you're very successful. I wouldn't do my own business if my hope was to be more hands-on with software dev unless you find a partner to whom you outsource all of the above, but now you're back to the situation where you don't have full control anymore.

If you're happy with not having a bigger slice of the pie, it's easier to just focus on SWE as an employee and let someone else figure out all of the other stuff unless you really crave the company building aspect.