Startups are much more team work as compared to success in sports. And success of many startups can be attributed to being in the right circles rather than founder's skill/grit. The modern day founder hero worship is exaggerated imo.

It seems like you’re downplaying the importance of teamwork in sports. There are very few who succeed in sports who aren’t team players. Most of them fizzle out before we ever hear about them.

Otherwise, I agree.

Totally. Deep inside the capitalist machinery, what really propels it forwards is the irrational human need to do something really crazy. If only rational MBAs ruled the world, nothing new would ever happen.

You can always just get a job later in that case.

This is true. Founding a startup probably makes one more employable for more jobs than training for tennis every day.

Of course it makes you more employable. If you put in some real effort towards running a business, you have to gain some amount of business knowledge. People who understand business implications of technical decisions are usually pretty well-paid.