I actually live in the Mount Dennis area. The elevated portion is next to sports fields (soccer, cricket, tennis, golf, etc.) and a pond. The area is in a floodplain. Used to be farmland. Have been following the project for a couple of decades now. We were able to avoid destruction that would have happened with a westward turn in SmartTrack (see https://urbantoronto.ca/forum/threads/toronto-crosstown-line-5-west-extension-m-s-metrolinx.28144/post-1882860
for an example).
I am fine with the current plans from Scarlett Road to Weston Road. Wish that the portion from Scarlett Road to Martin Grove Road was on the surface or elevated, but with construction already started and Doug Ford as Il Duce, we have to go on.
Currently, trying to make sure that the roadway will have pedestrian entrances on each corner of the intersections for the underground section. Failing that, then pedestrian refugee islands, multi-stage crossings, and bioswales.