I was listening to a presentation recently and the presenter talked about some of the restrictions in working with 32 bit SQL Server on 64 bit Windows hosts. Another person joked that any companies still running 32 bit software were way behind the times. I heard a comment that surely everyone runs 64 bit hardware these days, don't they?
I can picture the scene perfectly in my mind's eye. Throwaway comments from techies being arrogant or smug, or simply making unsafe assumptions. None of those are attributes to fill me with confidence in those techies' abilities.
I agree that 64 bit is a good and perfectly safe choice, but there are always edge cases. Just because something's a good choice if you have a blank canvas isn't sufficient justification for all other setups to be updated. Technical excellence and fitness for business purpose are not always the same thing.
Semper in excretia, sumus solum profundum variat