Whilst good intentioned, I'm not sure they always think about what sort of effect this sort of tech could possibly have on society (sounds dramatic eh?), even if this is a natural path for it to take. I can easily see this pushing nation states further down the MITM road of mandated locally installed https certs etc.
Yes I know some have already started doing this, I just think this sort of tech could speed up the adoption of such techniques.
It might help if they allowed easy custom configuration so that you could choose who your upstream DNS handler was (e.g. a pihole running locally etc), but given Google's business model and track record, I wouldn't be surprised if they dictate it should all goto their servers.