Hmm. On my android tablet (Asus Transformer Prime TF201), with keyboard dock, I can hit alt-Tab and switch between applications. Also, with the USB port on the keyboard dock, I can plug in a mouse and get a cursor on the tablet screen which supports normal highlight-cut-n-paste. In editable text fields in almost every app, the usual shortcuts for cut-n-paste (Ctrl-X, Ctrl-C, Ctrl-V) work fine, as does shift-cursor key highlighting.
No doubt that phones make these operations hard/impossible, but it's not a limitation of Android, as the Asus Transformer demonstrates. So I don't think this is really a fair criticism of Android as a platform. If you pair the author's Samsung Galaxy S3 phone to a bluetooth keyboard, I would expect the author's user-experience to be much improved.