The utility of unit tests greatly depends on the type of software you're building. Building a DB without tests is difficult and unlikely to win many customers

The utility of unit tests greatly depends on the type of software you're building. Building a DB without tests is difficult and unlikely to win many customers - particularly when news of that gnarly data race comes out. Whereas a crud webapp where everyone can see what's working and what's not is a bit hit or miss. At the very least testing helps communicate to a code reviewer "hey this thing does what I think it does".