After getting bug reports of users, making minor changes to functionality, and discussion with others.
- Blender is trying to make decisions for the user, this is OK as an **opt-in** for users who like, but I think we shouldn't try to second-guess user actions by default //(assuming when they do/don't want perspective mode)//.
- Its really annoying when it does _NOT_ do what you want, and we got bug reports from users who wonder why their view ortho/perspective is changing - see T39183
- Its difficult to support under all circumstances, (Axis Snapping by holding Alt while rotating the view for example) - see T40148
I really think we should not enable this by default.