I wish I had more information but this is essentially what I heard while watching the DIamond League broadcast over the weekend. It seems odd to only run the shorter races at an event whos name sake was a distance runner.

Also, I'm not sure I understand the push towards exclusively sprints (I consider <=1500m a sprint, albeit a long one). I'm sure it has to do with the attention span of the average spectator, but it seems like people who are watching Diamond League are more likely to have a genuine interest in the whole gamut of events, not just the ones that last a minute or two.

yep- men's mile and 2-mile, women's 1500, 3k and 3k steeple:

https://preclassic.runnerspace.com/...251&event_id=120

It's all about TV... As a long-time Pre Classic spectator/attendee, they've always tried to format the main portion of the meet so it squeezes neatly into a 2-hr live network broadcast window. Any 'excess' events (either longer races, or the occasional HS or Masters exhibition) were tacked onto the program earlier Saturday morning or the free session Friday night.