Maybe your work is important, maybe it isn’t. You can decide to invest a lot into it, which might affect how important it is, but you can also invest in more than one thing.
If a ‘side hustle’ doesn’t undermine (or improves!) the work, then having two options and being able to pick the better of the two doesn’t seem like a bad thing—it sounds like it enables you to pick the most important option.
Maybe your work is important, maybe it isn’t. You can decide to invest a lot into it, which might affect how important it is, but you can also invest in more than one thing.
If a ‘side hustle’ doesn’t undermine (or improves!) the work, then having two options and being able to pick the better of the two doesn’t seem like a bad thing—it sounds like it enables you to pick the most important option.