I see this as a major problem around the inner city. The reason developers go with the absolute bare minimum tree coffin design, is because that is what is prescribed by the City of Calgary's standard spec. If developers deviate from this and attempt to incorporate larger, more impactful trees (including Silva cells) into their projects, the City forces them to execute a Perpetual Maintenance Agreement. This requires them to cover all maintenance and replacement costs (for the life of the project). If the City has rip up sidewalks and repair utility work, this agreement pushes the cost of the corresponding landscape repairs (sidewalk replacement, tree replacement, etc.) onto the landlord or the condo board. Since most groups do not want this trailing liability on their books, they opt for the stick figure trees that you see today.
The inner city councilors need to champion this and broaden the City's standard specifications, to allow developers to enhance our public realm.