Software is typically malleable. What software is the hardest to change?
For me, the obvious cases are APIs near the bottom of the stack (e.g. imagine changing a Linux syscall) or systems with a large number of users (due to Hyrum's Law).
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Semver has a really odd relationship with software maturity. I'd take a v0.21 project over a v1.0 project.
Do any tech streamers try new software live? It'd be a really fun way of doing UX testing.
For hobby projects, I really like software where I can do small features or tweaks. Sometimes I don't have time for anything more substantial.
Website projects are great for this. Are there other areas?