I tend to agree with B2N2 that it may have something to do with stabilized approaches, though I'm not certain.
I have to learn something from all of the flight safety data that says folks are pressing or not meeting the stabilized approach gates. We have a lot more information/data today than we did back in the 60's thanks to a number of initiatives.
I have to remember that these stabilized approach gates are my last chance to meet the requirements. They are not the goal. I'd rather be fully configured with checklists complete prior to 1000 on a visual approach than be hoping I can bleed off the speed enough to meet the 500' gate.
If Boeing is also thinking this way, then they may have decided it is much safer to get everything done early and then be able to fly the jet without the distraction of a checklist.
As A37575 states, "Every company has its own criteria for a stable final approach." My company is seriously considering moving the gates back to a point earlier in the approach...because the flight safety data being received indicates this may be a prudent move. And my leadership is telling us that unstabilized approaches are often a key ingredient for a runway excursion.