As long as your product is good enough, no one needs a marketing budget or to measure if marketing is working.

And everyone has the resources and time to make their own analytics tools, if they need it, instead of relying on existing solutions

Let's say you make an incredible mousetrap, better than any before. Then you tell some people about it, they buy it, and stop thinking about it because it isn't central to their existence.

You've now saturated your market and have no ability to expand easily without putting effort into marketing or advertising. How do you go from there to 10 million units sold without a marketing budget of any kind?

What about if the package is extremely off-putting to people outside your culture or if the language on it is confusing. How do you know without measuring?

"If you build it, they will come" is only very rarely true, and chances are there was some kind of submarine marketing going on anyway that you just didn't know about.

Surely anyone that reaches adulthood ought to know that selling yourself well and having some damn good looks will bring your farther than just being the real deal?

It takes some huge lack of awareness of one's surrounding not to notice it

Everyone has the time to roll out their own analytics? Where do you work, Google?

You'd think stating that marketing doesn't matter and everyone has time to develop analytics would trigger some sarcasm detection somewhere