I think the important concept here is that if something is common/routine at your institution, and it's a reasonably safe thing, the less you need to specifically consent for it. We don't consent for Dilaudid PCAs or extra IVs (usually) or rocuronium vs succinylcholine or ETT vs LMA because thats all considered standard care, but that's a hyper-local definition. Does the surgeon consent specifically for a field block for post-op pain? No, and if your institution always does asleep TAPs for certain cases then it becomes more reasonable to not specifically consent for them. It's a matter of perspective and local practice.