Try playing with a Kindle Fire - Amazon completely skinned Amazon and made it incompatible with normal Android apps. I have tried putting many in through apks, most install but almost none work properly. Despite coming with a powerful dual core processor, the devices are terribly slow and laggy. The browser is awful compared to Chrome or Safari on mobile devices. They could have gone with a completely skinned version of compatible Android, with their own skin but retain compatibility with apps. Instead, we get different versions of Android apps for the Kindle Fire.
Which ones work improperly? The Fire *is* still Android, it just lacks Google, including its authentication layer. Apps may be tailored to the Fire because it has a non-smartphone screen resolution and lacks the newer APIs for addressing that automatically.
True, but I'd bet the OP was talking about laptop screens.