Like Alan Kay said about software: Simple things should be simple, complex things should be possible.
The thing is this takes a lot of resources to get right. FOSS developers simply don't have the wherewithal - money, inclination or taste - to do this. So, by default, there are no simple things. Everything's complex, everything needs training. And this is okay because the main users of FOSS software is others of a similar bend as the developers themselves.
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