[jusq2]

Yes it would. I doubt too badly though. How often is actual mail getting misidentified as spam?

Plus the quality of political expression imho on these platforms has gotten so low in terms of signal to noise that I don't think it would be a great loss to society.

The speed and reach of a message on social media today is unprecedented. Such platforms need ways to retard the flow of ignorance. That would really be the goal. And there is enough evidence to show that journalists and politicians are benefiting the most from such flows.