Do you do your project with a "customer-first" mentality?

Hey fellow indiehackers. Having been building several hobby projects, I noticed that everybody talks about the "customer-first" mentality.

I'm just curious, do you do your projects with a "customer-first" mentality? How does it work in reality for you?

If interested, more of my thoughts are here: https://atlasmic.com/blog/customer-first