I would prefer it if we didn't have such rigid roles. I don't like saying"this guy is left back, this guy is back up left back". I want options, I want the left back to be able to play let wing if needed, and vice versa. I want the centre back to be able to move to right back and so on. I think listing players as a single position and alternative for single position leads to blinkered views of the players and their potential role for the team.
I suppose you want the footballers to kick with both feet as well, not like Robben and Gerrard.
PS: I agree with you.