Yes, like making handmade clothing, only certain cases require advanced skills like that. I think over time less and less work will require that handmade software. More can be done by putting other packages together. I've been luck to work on infrastructure work that has ended up having new ideas and advancements over existing systems that we could justify a new version. But I do feel like this opportunity to do new stuff could shrink. How many compilers, databases, os kernel writers do we need? The vast majority of people can make great use of an existing compiler, or database. Justifying making a new one should be hard.