i'm not so sure on the technical aspects/development side, but you cant say things like meego devs in 2014 will have to support 2011 hardware, they won't, even android which you're comparing it to doesn't do that. there are android apps which simply won't run on the low-end phones released the same year, and every time a new build of android is released a lot of the apps need to be modified and re-uploaded.
personally, i dislike the way of building the one-size-fits-all type apps you are looking at, simply because you're catering to the lowest common denominator, instead of building for maximum performance you build for maximum compatibility which in the phone market can be a huge difference! we've been playing java games cross platform for years now, just find the right resolution for your phone, but with the n95 for example the java games came nowhere near the quality of .sis games designed specifically to utilise the n95's (at the time) power.