A startup with 2 people, one of them a marketer, can get twice as much done -- marketing can easily be a full time job.

A single person could easily get out completed? Even if s/he is able to learn "everything" eventually

Otherwise, I agree with you

Specialization & experience are good. So are more people. If finding a marketing or "business" partner for starting your project is your blocker, just learn it yourself.

Sure you could get outcompeted but honestly, if one person gets outcompeted, in almost all circumstances so will 2 people.

I agree with this to an extent.

So, I just need a tech founder that's willing to partner with me and do the marketing side of it.

In return, I'll do the same for them.

Flip a coin to see who goes first.

A founding team usually doesn't cover all of the core responsibilities necessary to run a company. Between legal, sales, marketing, product, hr, accounting, and engineering, it's rare that the founding team collectively has all of these skills mastered.