I agree that some of the older generation are unrealistic about being potty trained by 1, and when they think their kids were by that age, they weren't actually independently saying they needed the loo and going to the potty, just weeing on it by chance as they put there very frequently.
That said, I also think it's becoming culturally acceptable in some areas to leave it much longer than when it could be done. You could say, well why does it matter if people just wait longer and the kids will do it faster if 4 rather than 2. This might be true but in my mind has 2 problems, which are that actually being in nappies and sitting in poo is actually not very nice for most 3 year olds who are at a point to not like it, as we wouldn't like it, plus it seems a bit off, if people other than parents such a as nursery workers then have to change big ore-schoolers or even school children who could have been potty trained.
I know children are ready at different times. I know some are not ready until 4 or 5 or later. That isn't the issue and where there are special needs, no-one minds. However, most children without special needs will be ready and can be potty trained between 2 and 3. Yes it involves some work and has an inconvenient phase to it, but that's just one of those things. However, culturally it seems to have crept in in some areas that it's mad to try before 3 and pushing children too hard or just hard work and not worth the effort. That seems a shame when children are usually ready and can do it......we wouldn't delay them in learning to walk or talk, so why delay this other basic stepping stone if they are ready - a child close to 3 is very very likely to be able to do this. If that child is in childcare of some type for part of the week, why would people think delaying is a good idea, apart from they delay the effor for themselves.
And here's a thing, which might not be popular, but is the case......particularly late toilet training, which isn't related to specific additional needs tends to be correlated with other delays in development which are connected with being in lower so it-economic groups. Children from more deprived backgrounds are more likely to start school with weaker language and social skills and more likely not to be toilet trained. It's another sign of more limited parental input than children of more affluent families receive.
I think SureStart centres did encourage families to get on and toilet train between 2 and 3, in the same way they encouraged parents to read to their kids, but it is becoming more the norm to not try toilet training until later.....sometimes much later. Perhaps some parents simply don't have the skills or confidence to attempt it and go for the lomg hul with it, which is what required and using giant pull-ups is just easier.
Everyone has to decide for themselves when their child might be able to manage. For most between 2 and 3 is very doable - you might need a couple of tries,mbut that's fine. Delaying when a child can do it doesn't seem to benefit them or others who might look after them.