I'll give it a few days for objections before reverting.
I can only say that the lack of this feature comes up on a weekly basis on IRC, and a lot of people would be disappointed to see it reverted.
Not that my opinion matters, but I was very much looking forward to this feature in Postgres 10, but I understand if it just won't be stable enough to stay in.
I have my fingers crossed these issues can be resolved.
