Just to answer some Qs: the WHO guidelines on this are really directed at governments and healthcare systems, not at individual mothers. The WHO does no campaigning or education direct to mothers. The global strategy on bf is just that - for the world. It states - with evidence - that babies should be fed exclusively on breastmilk for six months, in order to achieve 'optimal nutrition', and that governments and healthcare systems are charged with making that possible, removing barriers to it, and so on. There is not as much robust evidence that breastfeeding for two years and beyond (alongside other foods) is 'optimal nutrition' across the world, because the trials and research that would make it possible to be certain of this have not been done, though there is plenty of epidemiological evidence and others that breastfeeding continues to be beneficial to the child. It would be quite hard to exhort governments and healthcare systems to enable all mothers to breastfeed to age three, four or beyond - for many, this would be impossible to do.
Other studies - such as several on breast cancer - show that there are measurable health benefits to mothers (in all countries) of continuing to breastfeed for what we in the west perceive as an extended time.
I think common sense tells us that breastfeeding a toddler when the only alternative fluid is dirty water and not much of that, and food is in scarce supply, is a very useful thing indeed. In the west, we don't have those major problems with supplies of water and food, so it becomes less of an acute health or nutrition issue to breastfeed into toddlerhood. However, breastfeeding is still a valid nutritional (and nutritious) option for mothers and babies, and in individual cases, it may enhance relationships and become a pleasant and loving way of nurturing(in the fullest sense of the word).
For cultural and other unknown reasons, some people recoil at the whole idea, and of course that is up to them!
What is not fair is to make up spurious reasons based on no research whatsoever for this response - there is no evidence (apart from people's opinions) that mothers bf for an extended time solely for their own pleasure or that they are doing so in order to keep their child 'a baby' for longer ( I am tempted to say, 'so what'... with the proviso the child is not being harmed and is happy. Some parents keep their four year olds in Thomas the Tank engine pyjamas!).
I can accept that some people just don't like the idea because it doesn't sit with them comfortably. I don't think they are any worse as parents, just as I don't think extended bf people are better.
By the way, contuiing to feed ( by breast or bottle) a toddler or child at night does not mean they are being encuraged to wake up and stopping feeding doesn't mean they won't wake. Everyone wakes up in the night. Babies and children who don't disturb their parents have learnt to get themselves back to sleep without doing so, that's all. They may only wake for a short time and be hardly aware of it.