Kinda like how iTunes was brushed metal forever while the Finder was Aqua and some apps roll their own UI to mimic Aqua? It's not like either Apple or Microsoft produce consistent applications, let alone the lack of control they have over third party developers. There is also Carbon vs. Cocoa, where different programs get different services "for free" from the operating system (e.g. spell check). Apple is just as guilty as Microsoft.
Kinda like how iTunes was brushed metal forever while the Finder was Aqua and some apps roll their own UI to mimic Aqua? It's not like either Apple or Microsoft produce consistent applications, let alone the lack of control they have over third party developers. There is also Carbon vs. Cocoa, where different programs get different services "for free" from the operating system (e.g. spell check). Apple is just as guilty as Microsoft.