The problem is the lack of an efficient input method. I personally haven't come across any good soft full keyboard. And special keys won't work on bluetooth key

The problem is the lack of an efficient input method. I personally haven't come across any good soft full keyboard. And special keys won't work on bluetooth keyboards on old Android versions. I personally do not have a ICS device yet, but I think it's definitely possible to develope on ICS if the input problem is solved.