I love the idea (also wondering when Google would build this)

But the situation where emails are backing upload as you drive to work and back to back meetings sounds like a mismanaged workplace.

The real impact (not a startup idea really) is fixing whatever makes the workplace like that. Usually everyone needs to be involved in everything and bad meeting management. Could be bad prioritisation and taking on too much work. Could be busywork.

If AI could solve those problems or help it might be good.