I almost can't beleive adults are having this conversation.
You have never been sitting at a light, and see everone around you with their heads down, while the light has been green for 4 seconds?
Inverse, Have you ever been rear ended because a person staring down at their phone at a red light just decides to roll forward because someones brake lights in the pack deluminate for a moment?
I ask, because point 1 happens to me daily, and point 2 has put my car in the shop for weeks twice in the last 5 years.
A totally separate point to make; what could you possibly be doing on the phone? Like how addicted to social media or work must one be that they wait for the briefest of moments to distract themselves? I ask that not to judge or poke fun, but to say that you MUST be doing something that you find so important, and thus taking your attention, that it is now your priority. Or else, you would choose to wait.
I know you, as a reasonable adult on this forum, know what people are talking about here.
I can stay parked at a green light the entire cycle, and it still will be 100% the fault of the person who rear ends me.
As for what I'm doing, it's probably something like scrolling the map to see what road I'll be turning on in 5 minutes, so that I don't have to look at it (regardless of whether I'd be touching it) later. Or a dozen other similar things, none of which have anything to do with social media.
And I know you, as a reasonable adult on this forum, know this.