I mean I actually really want to build many of those things (the first 3 anyways), and I have. I just don't generally show the results to people or make them use them.

I can't vouch for the quality of what I've built, but taking time to attempt to build those kinds of things has always paid off in terms of overall betterment as a programmer.

Then I can go back to a day job of mundanely moving protobufs from one place to another.