Why do you say that?
You get two different solutions. GTInspector is around since almost four years and it was brewed in the more research-oriented Moose environment. At the moment, the Pharo solution adopted just the multiple presentations part. I agree that it is not at all as powerful as GTInspector (both implementation and conceptual wise), but it's already better than it exists in other environments.
In the meantime, GTInspector will grow more to show what else is possible, and hopefully, the community will finally look at it and see that it offers a completely new way of developing :).