It's the platform experience that makes a good user experience. I largely agree with you (and there will be situations where you need native apps), but to play

It's the platform experience that makes a good user experience. I largely agree with you (and there will be situations where you need native apps), but to play devil's advocate, the differences between an iOS device and an Android device are less noticeable than the differences between a Mac and a PC. If a cross-platform toolkit is ever going to work, it will be where the platforms are (relatively) similar.