The iPad/iPhone helps with one aspect of the problem: There is only one platform to handle. No need to support broken old browsers.
[by the way - I haven't seen any statistics but it seems Apple users are more likely to update their OS/Apps to their latest version. So supporting old versions is less of an issue]
[by the way - I haven't seen any statistics but it seems Apple users are more likely to update their OS/Apps to their latest version. So supporting old versions is less of an issue]