Does that really matter though? Apps which require 4.0+ still frequently have terrible design which is just an iOS clone, complete with fuzzy assets and a frustratingly iOS-centric UI.
At the same time, developers like ShiftyJelly (www.shiftyjelly.com) show that fantastic crossplatform apps can be developed which have a great Android UI and are still very similar to their iOS counterparts.
I genuinely think it is just laziness, but while users continue to put up with it (especially since Android users appear to be happy to stick with a shitty UI on a free app compared to dropping a couple of dollars on a great one), it is unlikely to change.
At the same time, developers like ShiftyJelly (www.shiftyjelly.com) show that fantastic crossplatform apps can be developed which have a great Android UI and are still very similar to their iOS counterparts.
I genuinely think it is just laziness, but while users continue to put up with it (especially since Android users appear to be happy to stick with a shitty UI on a free app compared to dropping a couple of dollars on a great one), it is unlikely to change.