Can you explain this reality, as you call it, more? Why can't modern landscaping methods help promote more biodiversity?
Well, it's not a simple equation, but it takes time for benefits to accrue, if they do.
Building (and landscaping) is destructive of the environment on which you build, full stop. Mitigating the destruction is key, which means minimising the destruction of the habitat (building on the smallest possible area) and facilitating (or actively promoting) the (re)introduction of appropriate and native species - plant, insect, reptile, birds, mammals.
I suppose this means 2 things: reduce landscaping and manage new habitats.
Willow coppicing is pretty good for wildlife as it is accessed infrequently and, together with the meadow (pictured above) provides a pretty positive environment for bio-diversity (rotting trees are fine places for lots of insects to thrive).
3 things are important:
Destroy as little as possible of the existing site (inc. coppice), the species there are established and successful, they work.
Development of new habitats needs to augment existing flora and fauna and use local species. It needs more than a green roof and it needs to be managed.
Limit the area of public access. People trampling all over the place kill plants and animals and drive visiting species away. Build ponds and keep people out.
It can be done, but it has to be more than an afterthought. I confide our team is on it.