[zzzcpan]

Trained experts in short term user tricking into more engagement would be marketers and advertisers. Not usability experts. Usability is not easily measurable with A/B tests, as those are usually not long term enough and not done well enough to make any conclusions.

Note that talking to customers is not easy too. To the point that you need to psychoanalyze all the feedback to understand why they make those comments. Useful feedback is very rare. Customers are just not usability experts, they don't really know what they are talking about.