I heard many variations of this question during the initial phases of building startups from new entrepreneurs.

Think of it this way. If you want to be a racecar driver, do you really need to be a mechanic? It helps if you know how to maintain the car and tune it. Most of the great racecar drivers are not known for their auto mechanic skills. However, the racecar driver cannot be successful without his car being in the top-notch condition. In most cases, they find somebody else who can maintain the car for them.

In my experience, the best founders are the ones close to the customer. If you are in sales or customer management, it would be very useful. You can always find people to help you build the tech platform if you know what the customer wants and how to get it to them. A technical co-founder or an agency can build the platform for you.