My opinion, fwiw, is that the "import" really varies greatly from school to school. It can show institutional strength, or possibly a weakness. Can a teacher be "too comfortable" and somehow not do their job properly at their alma mater? I do like seeing faculty who have graduated from other schools, since it means they have undergone a similar experience as those under their charge but presumably have the objective sensibility that should make for good decisions. To sum up, not necessarily bad, but maybe worth getting more insight, if that's possible.