[Q] Why Windows phone apps have splash screen?

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http://forum.xda-developers.com – I get the point that splash screen look good instead of boring black screen ( if app takes time to load). But I am right now an Android user and thinking of switching to Windows Phone 8. On Windows Phone OS, it looks like most app have a splash screen. On Android, there is no splash screen in most apps, they open instantly. But on WP, why don't apps open instantly especially 3rd party apps. Sometimes I'm in a hurry I just want to use app instantly, so splash screen may be frustrating, don't you feel. On Android and iOS, apps (3rd party also, apps open instantly, hen why not WP8???) And (HowTos)