> the OSS community [...] never managed to produce software that regular non-tech-geeks want to use
That's true, barely, only if you equate "software" with "things that draw stuff presented on a display to a user". Regular non-tech-geeks are using open source software (in the real sense, meaning instructions given to a computer to make it do something) pervasively, everywhere, every day, on all their devices (yes, even the Apple ones, but especially all the devices they use that aren't in their pockets).
Open source certainly isn't a failure, it literally won the war.