Here's how it usually goes with me. Maybe some of you can back me on this.
I get an idea, design it, and start planning how to make it, which often leads to needing some sort of tooling or something else that I don't have. Of course, it's cheaper to make it than buy it, so I make what I need.
By the time I get that done and have what I thought I needed, if I actually make what my idea was to start with, then it was important. Sometimes that happens. But other times I've either forgotten what the original idea was, or lost interest in it completely.
Sounds like a waste of time, but it's not. I now have new tooling that I can use for future projects and it helps sort out what ideas really matter long term and what ones were just a quick "that's cool" moment that is very low on the priority list. The idea is still there, as well as the design. And sometimes I come back to them.
So, just making tooling isn't a bad thing. It improves skill, builds your tool "arsenal", and can give you useful ideas in the process, especially if it involves learning new methods and techniques.