If people can't find what you're selling, or don't know why they need it, they won't buy it.
So, think about how whatever you build is going to be distributed. Think about leveraging different channels that aren't being used by incumbents. Think about whether your product is a vitamin or an antibiotic.
Yes. when building product (more so for consumer product) there's only two important rules, how to people find you when they are looking for the value your service/product is creating (DISTRIBUTION) and how would they know if they're currently not looking for it? (MARKETING)... everything else... features, technology etc can be solved one way or another...
If people can't find what you're selling, or don't know why they need it, they won't buy it.
So, think about how whatever you build is going to be distributed. Think about leveraging different channels that aren't being used by incumbents. Think about whether your product is a vitamin or an antibiotic.