You can probably list all the reasons for plumbing to exist. There’s a few, but they’re largely well documented and understood. Cleanliness, sustenance and comfort seem to be the main three. Of course there’s detail, nuance and special cases, but all within the scope of those three.

Software can help in more situations and hence gets prompted by a wider range of “why”. I doubt you could list all the reasons for software to exist before the heat death of the universe overtook you.