It's a trade off. Sure, the ultimate testing is done by customers, but how fast one can push new fixes without tests? 1 reported bug could break many things.
> but how fast one can push new fixes without tests?
Well, if you refuse to write tests and you are scared to make new changes without them... then you can't push new fixes at all. Which is apparently fine for some organizations.
Well, if you refuse to write tests and you are scared to make new changes without them... then you can't push new fixes at all. Which is apparently fine for some organizations.