Isn't a cover displaying 'live' information better than the limitations of 'live tiles' in WP? In WP you _need_ to have a server which the apps connect to every 30min (or more, this is the minimum) to fetch the new things to display, most of live covers display live in SFOS, just check network monitor app (sadly doesn't work from glance view, but cover of terminal does update live even in that). Why do we need central server where you have to update the data every half an hour? When you can fetch the data live? Isn't it better???

(the only problem is people probably don't expect their app in 'minimized' state to still chug bandwidth and use processor a lot, which realtime tiles do, no problem with displaying graphics in covers - just check the czech weather app Medard, no problem with having couple of entries rolled around as network monitor shows you can update it, so what's missing?)