They're supar burley. Plus I'm sure some of the designs have been patented (which is why other people aren't duplicating it). Hollowpoint is a bike by Ironhorse... Not the technology... I think you mean Hollowtech-II. The cranks also use the external bottom bracket. Race Face has a few cranks using the external bb, Truvativ is supposed to coming out with a few new models using the exo bb in the near future. Rear derailleur bolts onto the axle rather than onto a derailleur hanger. I hate centerlock rotors, it's a stupid design, it just transfers more heat to the bearings in the hub. The brakes work well, despite being 2 piston hydros because the bodies are supar stiff. Dual control levers... Eh, they don't do much for me. The saint groupset is insanely heavy. Another thing is that with Shimano, if you want to use their stuff, you have to go all Shimano. Their rotors and hubs are all centerlock (though they do have the traditional 6-bolts adaptors available now). The brakes require you to use the dual control levers, which in turn means you have to run the shimano drivetrain. And if you wan't to use the rear derailleur, then you have to use their hub, axle, and brakes. Etc. Etc. Etc. Basically Shimano wants you to use just their stuff.
I'm more of a SRAM fan. As soon as funds permit, I'm going full SRAM, with their trigger shifters. SRAM derailleurs have stiffer return springs and they flop around less, also reducing chain slap. Plus 1:1 cable actuation ratio for their rear mechs.