Don't suppose you can remember the name of the documentary, whiteandstorm?
Duplodon, I wasn't overthinking. I agree with your final para but just as some parents might be making mistakes, so are some nurseries and childminders.
It is worth adding that I have checked the verb thing and in fact some children don't go through the phase, some skip it. My DC has been speaking in complex sentences for a while so I don't think he is going through it now, more likely he is copying to fit in. Thinking about it though the key thing about the verbal problem is not the verb endings, but the fact that although he is capable of talking about things including things that make him upset, more recently he has been not talking and I have had to spend time with tlc before he has gone back to talking - like he had been disempowered or something. That is what I am worried about.
I am not the only person who is concerned about nurseries (sweeping generalisation accepted) and I have read articles by psychologists who say the same thing. I am evidently not an expert in this area but I can and should question if things I see in nurseries seem inappropriate and are not meeting the expectations of parents and so should everyone, whether or not experts. The nurseries hold themselves out as experts and as such should accept questioning and be able to respond and discuss readily.
As for the agenda comment from theeternalstudent, I hear what you say but possibly you should consider whether your agenda and support is in favour of the officers at the detriment of the children?
It is accepted by some experts that psychological damage can occur in preschools and nurseries, in fact, so the discussion about nursery vs mothers being present is valid and important. It should not be assumed that there is (a) overthinking or (b) a refusal of the mother to let go (read my final para of my OP!)
The old lady who lives down the road thinks that a parent should be present until the child is at least 5, not only for safety reasons but also for bonding reasons. There might be some wisdom in this.
At 3 a child's brain is still being wired up and what they learn at this age will affect how intelligent, emotionally intelligent, secure, confident, interesting and interested, able to follow ambitions, etc etc for the rest of their lives. I don't think some of the nurseries are aware of this or meeting the needs.