Because nobody at Samsung stand had any answer on this.Why are you asking here online if you're at WMC in Barcelona !? LOL
The last Fascinate I played with couldn't do it either, and neither does the Epic. Is this because of the lack of 2.2? I just played with an Atrix, and it did it just fine.
I see no reason it wouldn't. It's a google maps feature to allow it, and unless the GS2 has a horrible touchscreen, there are no reasons it shouldn't work.
I am not suprised that those phones has some bugs in them since they are just demo devices. If the GS2 was released and still has those bugs, then I will be very worried.