People think they will be less effective, because they reply to a lower percentage.
At the same time, you will be flooded by ever more spam and ads, completely offsetting the decrease in interaction.
As noted in the article, you might in the future not even notice you're being AI-spammed. What if "timharek.no" is AI-generated?
What if Wisp CMS being so upfront about its use of AI is part of the trick? It just got exposure on HN, after all!
it's a pure numbers game. even people who think they're immune are 1 highly-targeted, pain-point addressing email from replying.