Every child is different, some will benefit from fulltime at home with parent/s. Some will benefit from Nursery.
It totally depends on the child imo.
I worked in Nurseries for 10 years before having dd. Many children started fulltime at 3 months old and stayed with us until they were 5 years. It became apparent that some of them had really thrived and benefited and others possibly would have been better off with more one-to-one care at home. This could be to do with the child, or in some cases this could be because i knew the kind of environment they had when at home and felt they were better off spending more time at nursery.
Some children grew up thinking that we were their parents (actually calling me Mum which of course i corrected them on), and they never had holidays from nursery because their career driven parents took holidays themselves and left relatives in charge of collecting and dropping their child at nursery.
I have heard from reception teachers at our local schools, that pupils who have previously been to nursery get on far better education wise once they start school as they already have the groups social skills, sitting still and listening skills, carrying out instruction etc. So the groundwork is done and they can go ahead with the working once they start school. Compared to children, who of course have probably learnt all the same skills at home, but find it difficult to use those same skills in large groups and unfamiliar environments. So they have far more settling in to do prior to "learning".
So initial thoughts are - oh yes nurseries are great for them.
But whose to say it is necessary that they are ready to "start learning" straight away and leap up to be top of class instantly.
Other countries in Europe don't start formal education as early as Britain, but there is no evidence to say that British pupils do better in senior education due to their early start with education, in fact i have read research that proved the opposite.
So my own opinion is the ideal situation is that if a child seems old enough and ready to attend a nursery parttime, and that they enjoy it, then great. But no i don't think its an essential part to a child's upbringing that should be recommended.