[type0]

> It's developer-editable - which is not even remotely close to being the same thing, except for that tiny subset of projects where end-users are developers.

There are plenty of FOSS software where one could do meaningful changes that improve your user experience without being a developer. This includes customizing the theme for your desktop, translating the software into another language etc

What do you even mean by open system?

There are plenty of regular (non-dev) people that propose great ideas for changes to FOSS programs that later get implemented, you don't get this kind of interactions with your users with proprietary sw because that your "intellectual property" and who the hell are you to dictate how to do things with my property attitude (which is, if not implied then anticipated by most users).