Not necessarily! I for one don't mind either painful, or painless digestion, but by with the way it is described in the VSRD it logically should lessen the chance for a sleeping meal to wake up in response to digestive damage. Additionally, as it states in the final bits of the feat's description, 'In addition, it may enhance the effects of certain feats with GM approval', like Rissle's ability to stealthfully devour and digest her prey with the 'soft maw' feat.