Of all the things to complain about Apple, I find that a odd choice.
As a Mac-using video editor, I find ProRes (their proprietary low-compression, processor-friendly editing video format) to allow for an excellent Final Cut workflow even on a lower spec Mac Mini. Using a Blackmagic Cinema Camera with native ProRes support helps a lot too, compared to smaller-file but processor-intensive DSLR recording standards like AVCHD and h264.
More to the point, I find no difficulty at all to playing or converting non-Apple video files. The comes-free-with-the-machine iMovie editor may not natively support every oddball file you throw at it, but there’s very little your mac won’t work with with some open source help from the likes of VLC Player and the Handbrake converter. Same goes for Windows, I’m guessing, since these tools tend to be multi-platform. I’d bet Windows Movie Maker or whatever Linux folks edit on are no paragons of file compatibility either.
So it seems your experience isn’t mine at all. Unless you strayed completely from the PC narrative and said “Apple” meaning “iPhones and iPads don’t play well with .ogg or .wmv or whatever compared to my Android thingamabob or some platonic ideal”. In which case, yeah, they sure don’t.