@pringlis: you're right that Braid Road reopening is at the request of Lothian Buses. Annoyingly it's not the traffic volume per se that's the problem apparently, it's apparently the number of rat-runners coming out of side streets in the lower part of Comiston Road (Comiston Place, Comiston Terrace, Braid Crescent, etc) causing chaos by turning left/right.
I suspect that a high proportion of those rat-runners are coming from Charterhall Road/Cluny Gardens and in the "good old days" would have gone up Midmar Avenue/Drive, along Hermitage Drive and then turned left up Braid Road. From what I've seen of the Morningside Clock junction there's next to no traffic taking the left-hand lane there to go up Braid Road these days, so I don't think folks are going that way and then cutting back on to Comiston Road further up. (I can't fathom just now why the Braid Road closure would encourage rat-runners to turn right on to Comiston Road from the roads to the east.)
I believe it is a non-trivial task to put in measures to dissuade rat-runners from using whatever routes they can find through a highly permeable street pattern such as the Comiston Road/Cluny Gardens/Midmar Drive/Hermitage Drive area without making access unreasonably complicated for residents. (We have a similar dilemma where I live, as it happens, though on a slightly lesser scale - folks rat-running to/from Comiston Road/Oxgangs Road to avoid the Fairmilehead traffic lights - but most of the local residents don't seem to want any of the non-active travel access routes impeded in any way.) So I have some sympathies for the council trying to come up with an effective SfP plan for the area. But I am concerned that the Braid Road southbound reopening may have been decided without a proper understanding of the cause of the problem complained of by Lothian Buses. And to go ahead with that without reinstating the modal filters originally in the quiet route plan looks like just giving up.