Is the compiling and test running too resource intensive?
Do you build every commit? If so, why?
I see the value in larger teams, but for solo stuff I just find it slow and annoying. I'm using go, and it compiles fast, so that could be a part of it.
I end up with all kinds of random crap on my own machine. It's very easy to accidentally e.g. globally install a library that wasn't properly listed in my dependency management. So having a separate standardised/controlled build environment is a good way to catch those. It also helps with flaky tests or random "works on my machine" problems - this way my tests are at least getting run on two quite different machines (different OS/arch/etc.)