neat. The one thing I do very regularly on my touring bike is to stop and take photos while still straddled on the bike. I usually skootch up to the headset area to be able to keep the bike stable with my knees (I always have sunscreen on the headset and downtube) so this could be annoying.
I too find two water bottles and one fuel is fine, plus I stick other water bottles in one of my rear panniers if need be.
but given that you say this is a good system, I'd have to say its a neat idea--before I realized it put them a lot higher , I didnt think it was practical.
Yeah that might cause some minor inconvenience but our frames can handle 3 bottles, OP might not have the luxury on their frame?