My mother and l were talking about this yesterday. It IS the fault of the parents if children regress to wearing nappies and not using a knife and fork. I well remember being at Sunday dinner with a group of older relatives when my daughter was about fifteen months old. I felt we were both under scrutiny. My daughter sat on a raised seat at the table and behaved perfectly, eating her small portion with a spoon and fork completely independently.
As for toilet training, my generation with babies born in the 1990s were considered lax by our parents' generation as it was normal for girls to be trained around their second birthday and boys six months or so later. My mother said it was normal in her day for babies to be out of daytime nappies by eighteen months. This is a job for parents not nurseries or schools and a three year old without disabilities should not be in nappies, let alone a five year old. Once trained, why on earth would you put them back in nappies?
Hithere, l understand what you are saying but if you waited for readiness with many children they would never be out of nappies. There is also a window of opportunity, usually between the ages of two and three, when readiness is allied with the eagerness to try. Older children can be very stubborn and it is not doing them any favours to hold them back in this way.