You're still engaged with the screen, and for an extended (at highway speeds) time.
Why do you think this time is extended? I have driven for many years with dash mounts for phones, It only takes a tenth of a second to verify some information on the device in terms of navigation and and running Waze I have eliminated way more potential for danger than I have caused - I have slower down for objects on the road before they were visible, or prepared for cars suddenly stopping for traffic beforehand by increasing the distance to the car ahead.
Mounting options are plentiful in most cars. Vent holders, cup holderholders, stick ons, mats
But they are all extra things you have to buy and generally do not work very well. I have used them all; vent holders are probably the best, but are prone to failure with cars vibrating as they drive, and sometime vent designs totally mess with vent holders. Cup holders are the worst idea because they drag your attention down and are no better than a phone just set in the holder. Stick ons are too fussy and most people will not use them, mats are terrible because now your phone is at a really bad angle and you cannot read it...
I'm taking about some kind of design that would provide a simple shelf near eye level into which most phones could be placed without falling over or down. But there is nothing like it on any new car I've seen in years...the closest they come is built in shelves which again are way below eye level.
There is, however, no escaping the problem of doing work on a phone for longer than 2 seconds at a time.
Sure there is; the phone being at eye level means you don't need to take two seconds for something, now you can take a fraction of a second instead and have the road in your peripheral vision the whole time.