For me, current form v. function decisions usually revolve around something like small kitchen appliances: cool, retro-looks-great-on-your counter vs. a Clydesdale horse of kitchen gadgetry.
For instance, Bedroom: Carpet or Hard Woods?
All our homes have had hardwoods in the bedrooms, and I have to say, I think I'm ready for some soft stuff underfoot.
Office: Elegant Sawhorse vs. Chunky HideItAll desk
Here's our desk at Casa Giese - a very heavy rustic thing I had made years ago in Texas. It does a halfway decent job of hiding all our junk, but it somehow makes me feel bogged down.
Bath: To Clawfoot or not?
Gorgeous form, but certainly not the winner of the multitasking contest.