Auto enable of Do Not Disturb Mode on Android O gone

Am using Pixel XL and its onto Android O today. Two things that are bothering me are:

Do Not Disturb mode used to be enabled by default on Nougat during calls and end after call. This was very helpful for me as I don't get disturbed during call. This is gone in Oreo and saddest part is, its not even customized to enable it. Does anyone know how to enable this?

I used to mute and unmute via ear phone button on call, but now clicking this button would disconnect the call.

Very unhelpful...

Auto enable of Do Not Disturb Mode on Android O gone

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