There is some news that I've just read about in the Pod Bay SE chat room:
Wired: SpaceX's Mars Plan Hits a Pothole. Up Next: The Moon?
Ars Technica: Elon Musk’s Mars rocket may be about to lose half of its engines
The news items include a lot of background and interpretation and speculation and future-predicting and it's hard for me to roll all of that back and identify just the bare technical facts.
Is propulsive landing of a Red Dragon capsule on Mars more difficult than originally thought for some technical reason, or is it just that the goal is less attractive for logistic, business, or long-range planning types of reasons?