I think there has been an influence of BLW on traditional weaning though which is no bad thing. I did traditional weaning with my son and probably introduced more finger foods more often and he used to have a completely self fed lunch most days. But as others have said, that's not really BLW.
I don't though see the point of having to stick to the 'rules' of a technique. It's a technique, not the law and if you want to take inspiration from it as I did then I see nothing wrong with that. Also as my son had been a bad sleeper since day 1 and a hungry, hungry boy, I couldn't psychologically not feed him his tea because I was too scared about him being hungry in the night. I know that milk is the main source of calories till 1 etc, etc but it's tough when you've been woken up 4-6 times a night since birth and you're doing PUPD to try and get him to drop those night breastfeeds. I also wanted to have more influence about the nutritional content of what he ate.
Anyway, sorry for hijacking. The thing is whatever you do, you get to around the same point by about 18 months - 2 years. There are lots of claims that BLW are less fussy and the book makes claims about obesity but I've never seen any research on it and certainly my traditionally weaned son isn't fussy at all and is still following the same growth curve he's followed since birth.