What is the most common Startup mistake?

Maybe all of them? 😂

Shipping with bugs.

I would say that this is not a serious attitude to marketing. That is, the product is made for the sake of the product, and not for the client.

Being in love with your solution more than the customer problem.

They focus on: Product: 70 Marketing: 20 Sales:10 Customer Success: 0

Not focusing on Churn and customer retention above all else.

I think ignoring customer feedback is the common situation that start-ups may encounter in the 0-1 phase. User feedback is the most important thing, but some founders focus too much on the financial part.