Just to reiterate 'big babies' do not need weaning earlier. Not only do we know this empirically, it makes no logical sense either. If a baby is thriving, clearly the milk is doing a brilliant job. Especially when at the other end of the spectrum people say oh baby is small, clearly they need more. A baby's gut matures in the same way, big or small and a baby will be ready for solids when they are ready. As explained above, size, waking more or needing more milk are not signs. If a baby can sit, pick up food, chew and swallow it, they're likely ready.
If a baby is hungry they need calories and that is always going to be found in milk. Food is negligible at the start of weaning and they often take little so you need to offer more milk if necessary.
Also, saying they won't take it if they don't want it is misleading. Yes, the tongue thrust reflex serves a purpose but too many times I've seen the puree be scooped back up and pushed back in. I watched my SIL do it with my niece. She was lying on a beanbag at 12 wks while sil tipped food into her. Sadly, it had a v poor effect on her health and sil regrets it daily. Her 2nd was weaned at 26 weeks.
I think the guidelines are sensible. They use language like around 6 months or about 26weeks and explain the signs to look for and the red herrings to avoid. I weaned mine when they were ready and as they were biologically average, this was around 6 months. If planning on weaning early, it should be done on medical advice as sometimes it is necessary. But it shouldn't be done according to myths about big babies or developing countries or because somebody on the internet said it was fine.