There are no limits on the number of views you can create and there is no right or wrong on how many there should be in a workspace. The number can depend on the count of projects you're tracking, on how different those projects are, how much data and to whom is being reported, and so on.
Creating multiple views based on the same set of projects may be useful for when you intend to share those views with different audiences. This allows every view to be tailored in content and appearance, and if needed, can help minimize the number of actions the viewer will have to perform to get the information they seek.
Nonetheless, having multiple configurations within one view is an equally reasonable solution that can add to the convenience of use and greater interaction possibilities.