I'm a very casual user of SketchUp (I use it once every few months), but I have a single file which is a detailed model of my house, which I have invested many hours in creating, and that only works on the full Desktop app. So the free web app is not an option for me. And a subscription doesn't make financial sense so I have to ask for a new trial every time I have a home renovation project and I need to modify my model. I'm aware that eventually they might refuse a new trial (they haven't yet) and that day I will just stop using it and learn Blender.
However, I'm now realizing that at least for home renovation projects, an essential feature is the SketchUp 3D Warehouse, where you can download user shared models of a TV, a toaster, a chair, etc. Specially for a casual user, you don't need to have the exact model of your real chair, just a chair will do. So the warehouse is an essential part of the value.
I'm sure there are alternatives for free models other than SketchUp 3D Warehouse, but having it directly in SketchUp is super convenient.