Looking at how different the personal preferences are in term of feel, size and model of Exp. Pedals and the fact that at some point in time they WILL wear off, maybe it would be a wiser move to provide 2-4 TRS connectors and leave the choice to the users.....just my opinion...
In terms of replacing the pedals this is true. But i used a solution like this and did not like it either. Either you have to place your spare pedals losely on the stage or put it all to a extra board. Why not have two durable metal pedals onboard AND 2-4 TRS connection for extra pedals?
I used the J-12 for a long time and LOVED it.