Unlike the MS Natural 4000, all of these seem to lack one or more of: symmetrical meta keys, F keys, standard navigation cluster, right hand Ctrl and/or Alt, cu

Unlike the MS Natural 4000, all of these seem to lack one or more of: symmetrical meta keys, F keys, standard navigation cluster, right hand Ctrl and/or Alt, cursor keys away from the main typing area (probably necessary for symmetrical meta keys anyway), PrtSc key. (A pause key would be nice too. I think I can survive without ScrLk.) I like having a numeric keypad, but that can always be bought separately. Volume controls and mute would be a nice. I like them separate, but Fn+something is acceptable. Even if I'd never buy any of them, I do like the fact that there are all these different layouts. But it's a constant mystery to me why none of them are remotely like the very standard MS split layout that's been around for over 25 years.