As far as I know, Revit doesn’t require roomBounding lines to create, neither to place a room in a view.
I use Dynamo to create rooms in two ways :
- Unplaced rooms: in this case it requires three main parameters: name, number and phase.
- Placed rooms : in addition to the previous parameters, it requires a location (point).
In Speckle receivers, I see that all previous parameters are available to be used (as dictionaries which is great !). So I think it is possible to use the basic parameters as room name, number, phase and point to place rooms via the Receive option in Speckle for Revit ?
Regarding walls, thank you, I installed the new version and it is much more better in handling elements without changing units. 
However, I found a new issue which is geometry quality. (Please see below ). This is a screenshot from my Stream in Speckle Web. And another 2 screenshots from elements after I imported them to Revit 2019. Did you have any similar issues before ?
I suppose it is a because of project Coordinates? in this project w’ere using the real coordinates, which is really far from the Revit 0,0,0.
Plan view :
3D :
