As a mid 20s male with no thoughts of having children anytime soon — all I can think about is how many people seem to be grateful about being given the chance to expose their children to a respiratory system-based illness in which even short term effects aren’t understood.
The second (and more important in my opinion) is that the primary developmental events that take place at kindergarten age are social. How to interact and relate to others individually and as groups. For cognitive development, it is structured imaginative play that is critical, and near impossible to do virtually.
Many parents fear their children will miss out on this key developmental stage.
For the youngest kids, the worst thing you could have happen in this situation is for them to learn to hate school. The way this day went for my 5 yo, it seems like his enthusiasm for kindergarten via zoom is rapidly diminishing to frustration.
And AFAIK preschools has not been a major source of spreading of the Corona virus.