I don't understand why so much sleep training has issue with nursing to sleep? I suppose it's a problem when LOs are older and don't need to eat before a long stretch of sleep? But not quite sure when that happens?

I've always nursed K to sleep and haven't seen the issue with it. I think of it like tanking her up for a long night without eating. If she falls asleep after nursing for a good amount of time, why would anyone in their right mind want to wake LO up, stimulate with a book or play, and then try to put LO back to sleep? Am I totally missing a "duh" train of thought?
Does DH feeding with a bottle to sleep count as the same thing?

Also, I am quite unsuccessful with nursing to nap, so I don't see it as the same thing.