That goes way beyond OSS. Remember early Windows 95? When every Office release revamped the style guides (button bars are now flat!), Borland applications looke

That goes way beyond OSS. Remember early Windows 95? When every Office release revamped the style guides (button bars are now flat!), Borland applications looked entirely different and there was a plethora of badly mashed together VB5 shareware? Heck, I remember Amiga-heads complaining about MUI applications… It's rare that you get something consistent once you throw enough developers at it, especially if different tooling is involved. And this only increases with the age and popularity of the platform… Most programmers can't design. And designers are only marginally better at it.