r100 has been mentioned as the target release for removing support for rendering
That means you can instantiate an instance of
THREE.Geometry, but you will have to convert it to
THREE.BufferGeometry prior to adding it to the scene.
By my notes, the remaining examples where
Geometry is rendered are
svg_sandbox.html. I believe in all other examples where
Geometry is used,
Geometry is instantiated, but not rendered.
Also, to do is #14608 — an important one.
I would also suggest renaming
At some point,
THREE.BufferGeometry can become
THREE.Geometry, but that would be in the distant future.