Defining boundaries are essential for the development of any person or any field of human endeavour. There is no exterior place and no interior state that does not have boundaries. As a parent, I know the crucial importance of setting and observing boundaries in bringing up my children. I also know that the first thing to do in setting a boundary is not to lay it out straight away, but to work out what to do when, not if, those boundaries are crossed.
Science too has its boundaries and it is an essential aspect of creating any conceptual system that domains, key terms and constructs be delineated and defined. Defining boundaries in the creation of metatheories can be a tricky business but this makes it even more important to do so. Because metatheories often cover a lot of territory the task of setting the domain of that metatheory can often take a back seat to the issue of integrating lots and lots of stuff. The big picture building aspect of constructing the meta- can subsume the more humble task of seeing where the limits to these ideas may be. At the most basic level the science of metatheorising needs to be very aware of the central importance of boundary setting so that it can remain humble in its work.
Humility is important in science because humility allows for doubt to arise. Humility allows for questioning to emerge in the face of mystery rather than answering when we may not have all the answers. We set boundaries out of the recognition of our limitations and the need to communicate those limits to others.
When integral metatheorising does not set the limits to its knowledge, when it does not define the domain of its expertise, when it does not describe the contours that mark out its place in the world of knowledge and ideas then it is no longer a science. It is an exercise in aggrandisement, of self exaltation and ultimately, if no boundaries are ever acknowledged of delusion.