One so-called "rationale" for non-Mac like interfaces is UI consistency across platforms. This is a lame excuse. I not infrequently move between applications every few minutes. I rarely move between platforms more than a few times per day. If I'm going to do a UI context switch, I'd rather do it when crossing platforms (where it is bleedingly obvious which mode I'm in and was accompanied by physically changing location) than when crossing apps on a single platform.