Physics is like sex: sure, it may give some practical results, but that's not why we do it.
Richard P. Feynman
I think the same is true for a lot of folks and self hosting. Sure, having data in our own hands is great, and yes avoiding vendor lock-in is nice. But at the end of the day, it's nice to have computers seem "fun" again.
At least, that's my perspective.
I'd say it gets a little different with command line utilities
maybe "utility" is the appropriate term here, but I'd call something like
grep
a program, not an application (again"utility" also works).
To be sure,
grep
is extremely powerful, but its scope is limited.