I'm finding this thread incredibly interesting because of the justifications people are giving for not playing with their children. Of course nobody is saying they have to be played with from dawn to dusk, life is busy, work has to happen, but it would benefit them immensely to have an adult caregiver play with them daily, and the closer that caregiver is to them the bigger the impact.
For me it's something I had a really positive experience of as a child and I natural pass it on to my own children, but I also have training from parenting and communication courses I have attended to do with my DC's disability where joint attention is the keystone of communication. Joint attention doesn't mean setting up elaborate play scenarios and leading the child to them, it's taking the cue from the child and joining them (initially wordlessly) in exploring the things that they are interested in. So with my disabled child that might be them lining up pots of paints and going through the colours verbally, then moving them and arranging them in different ways. I would be helping them with that or naming the colours or even just being at their level and acting as interested as them. But with my daughter it might mean pretending to be a cat/doctor/explorer and letting them initiate the interactions and just going along with them.
I feel a bit sad that some children don't get much of a chance to have interactions like that at home. It's not 'what nursery is for', or grandparents. It's part of parenting and I feel like we sign up for this stuff when we decide to continue with a pregnancy. The benefits to children are immense, not just to communication but to self esteem, trust, resilience, confidence, problem solving, gross motor, fine motor... Not to mention the benefit of oxytocin, that's released just by you being close to your child.
A little goes a long way but there does have to be something.
I wonder if any speech or language therapists have read this thread and what they think?