It isn't an 'either/or' proposition. As with Android, the Qi charging supplements the plug in. I can use Qi or USB to charge, but Qi is easier.
Nor did I explicitly state so. Apple is about simplicity. There is nothing simple about having 2 ways to charge, one being extremely inefficient and wasteful and the other not. For better or worse, that is probably how Apple thought of this. Also, wireless charging is not mature yet. Apple is rarely the first to jump on a bandwagon of new technology solely because it's new and cool.