[Illniyar]

Not sure what the parent meant, but that sentence is most definitely true for the vast vast majority of software development of products - websites, apps (desktop, mobile etc..), IOT etc...

Making products is, as far as I know, also the vast majority of software engineering jobs.

I'm sure there are some software development work that is writing code that isn't integrating third party code- especially in library maintenance, low-level embedded stuff and some core business code of products. Even if your products are novel and their core require specialized code, only a small number of the developers in the organization will work on that, the vast majority will work on things around the core.