We had a similar argument for my store. We have been getting 1000 units over forecast in ship and have supplemented it by having all tls and some tms pick a couple carts of ship atleast. Now our dsd wants only sfs tms to pick ship and that we should only back up opu. Needless to say we are doing what works because after not even half a day we realized it is impossible.
That plan worked when we had 3 hour goal times, now you have to have so much flexibility to get it done.