I can't agree with you more. That's one of the prime reasons I don't care for Ed/Win: because it ignores and even detracts from the dynamic between Ed, Al, and Winry. I think it might work as a threesome, but even then I have a hard time seeing them as anything beyond platonic (at least in manga-verse). It's almost as if the motivations Ed and Al have changed to better suit the relationship shift, and that doesn't sit well with me either.

That, or I'm a bitter Elricest-shipper. j/k XD