it's about consent. asking people to volunteer is fine, but mandating it isn't. People have lives, kids, obligations, which might be worth more then two days of time in lieu.
Not immediately. It's more of a warning about throwing short term resources on to get quick results. However, under resourcing and overworking staff does not exactly lead to speedy development.
The key point was previously. It's not like this is their first attempt. They know the work that goes into this and they know what their aims were long ago.