In agreement with a few posters here: We need more midcore content, or at least several levels of content to make the ladder climb from bottom to top more sensible.
Is it good for the MSQ to be very simple? Yeah, sure. I get that. Make that your baseline content level.
Is it good to have Savages and Extremes for more difficult content and high-end players? Yes, those are the people who stay subscribed more consistently, you want them playing your game.

Is it good to have this solid fucking cliff-wall between these two elevations of content design with absolutely nothing in the middle?

No.