most of the work in programming isn't in making it do the thing. a lot of people will agree with that.

but it *also* isn't in the edge cases, and it also isn't in the error handling or the reliability, or in the UI.

no, most of the work is in designing it such that *every level of the stack*, every abstraction and every design choice, every part of the system works together such that it's even *possible* to create a good, logical, easy-to-understand interface for humans to interact with it, without ever going "oh yeah it's a bit awkward but that's just how the system works under the hood" at any point

which is precisely why almost no programmer even does this work, in FOSS or otherwise