Scratches caused by tools etc cause stress marks that can cause failure. If the Vise grips don't leave marks then no harm done. Most tools do not have serations on them just flats to prevent scratches.

I never used a tool, ever. I always loosened the LCA and slid it back if the bar didn't come out on it's own. Many people don't clean the rear of the Tbar socket or release the Tbar completely by removeing the UCA stop. If you don't you will need the tool.