The dirty secret is there's a lot of people employed to do things that are not "products that matter" according to your definition.
Probably a vast majority of software written never actually gets interacted with by a user. A vast majority of VC-funded software probably never gets interacted with by a user.
Feels pretty great to work on a product that actually has a user, and that user isn’t actually the product (and that user isn’t being manipulated or exploited). Tiny, tiny minority of the software industry I work in.
If you don’t think about it as a per-software criteria, but per-feature criteria, the vast majority of software features developed are probably completely ignored or even untouched compared to the “critical few”.
Very, very long tail distribution. The most executed 100 lines of code (maybe some Java class init snippet, or some Linux kernel snippet) is probably executed more per day than the per-day bottom 80% of all code combined. Maybe the bottom 99.9% of all code combined.