One of the Constitution's big failings is this sort of thing; deeply vague wording. What counts as interstate commerce? What counts as reasonable? What's considered press activity? What's considered illegal speech?
If you were writing a new one today, you'd define some stuff more.
I don’t think “interstate commerce” is unclear at all. That’s one where started with an end goal in mind and rationalized everything in between. There is no sane English reading of that passage that resembles the current interpretation at all. We just repeatedly mentally Google Translated it to Spanish and back until it was vague enough to allow what we wanted.
The law isn't computer science as much as Silicon Valley would like to make it so.
That doesn't mean we can't learn from mistakes and make certain things clearer.
I think the Founding Fathers would've had some thoughts on Flock cameras and Facebook.