UPDATE: RTC was pulled from 7.0, although not for the right reason. Following, it just seemed like the A8c folks were fighting the big boss about using a custom DB table, which I do not understand their reluctance here. It’s clearly the better option.
Now, in 7.1, we’ll go through the same exact process. Wait until a week or two before Beta 1, scramble to finish where they left off in 7.0, and it’ll be only marginally more complete than it is now.
Plainly, it’s not ready for 7.0, but even worse, it shouldn’t be in Core at all.
It’s not going to be used by 80% of all users. It’s a feature for workflow-driven publishing, but 90% of all WordPress sites don’t have a need for a workflow! It’s one author. Or, it’s WooCommerce(growing in overall share of WP sites).
It’s a super cool feature, but it should 100% be a Canonical Plugin. I don’t see a more perfect candidate for that.
However, since it’s been promised as a headlining feature of 7.0, there’s induced momentum in A8c that just cannot be overcome at this point. The feature is dictating the schedule and architecture, versus it being built from a first principles perspective. So many questions are just not being asked because “we have to get it in”.
WP Core Philosophies are mostly now meaningless.