It also depends a bit on what we are talking about here.
There is not one type of development and there is not one type of testing. As a freelancer doing frontend development you will work differently than as an employee improving internal software. As an indie maker who primarily builds and offers complete products themselves, you'll work differently again. And I could list many more ways to work...
Therefore, I would not say that you absolutely MUST test everything and always. It depends on the circumstances. And if it doesn't suit your work, then that's okay.
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It also depends a bit on what we are talking about here.
There is not one type of development and there is not one type of testing. As a freelancer doing frontend development you will work differently than as an employee improving internal software. As an indie maker who primarily builds and offers complete products themselves, you'll work differently again. And I could list many more ways to work...
Therefore, I would not say that you absolutely MUST test everything and always. It depends on the circumstances. And if it doesn't suit your work, then that's okay.