Sometimes just sitting and thinking before action is the crucial difference between success and failure. A related objection might be that constantly changing ideas or holding more than one theory is not a good foundation for a successful, ongoing political project. Clearly we cannot abandon ship and build a new one in mid ocean, but we can build a better one while still sailing in the first. The idea of somekind of agreement is also important. This is particularly obvious in politics.
Joint activity requires joint intention which requires shared concepts.
This does not necessarily mean total agreement just some form of consensus and co-ordinated plan. Thus political theory formation requires consensus. We also need a sense of a common goal that can only be clarified only through dialogue. These are the problems faced by any theoretical group and the solutions will probably be many and varied. Finally it should be remembered that theory is not ideology.