"getting babies interested in food rather than passively accepting spoonfuls of slush is good for them."
I don't accept this dichotomy.
My eldest had almost no interest in food despite all the "playing" I encouraged her to do with various bits and pieces.
DD3 is mad about food but obviously prefers mush to things she can pick up and play with.
There is nothing passive about the way she gets excited in anticipation and takes part in her feeding - she quite clearly savours each new taste.
BLW appeals to all of my prejudices and my utter loathing of puréed food.
But I've done less of it with each baby and weaning has gone better with each one.
DD1 was very co-ordinated by 6 months and could hold and eat an apple and pick up peas and eat them, but even she didn't seem to really enjoy BLW.
My other two physically struggled to eat the food they were given. When I give DD3 finger food instead of mush on spoon, I don't think she even gets that it is food.
Feeding mush (finally) feels more natural to me and if I didn't have a blender and spoons I would give my babies chewed up food until they had teeth and could easily eat more adult food.
BLW seems to work brilliantly for some.
But it's just one useful approach. It's not the path of weaning righteousness.