Its possible but of course slow because of https://gist.github.com/jboner/2841832. Data locality matters a lot. Moving data around the network when it doesn't really need to be moved is heresy (unless performance doesn't matter, then who cares). Remember the computer doesn't care about your religion which says only this can do this and only that can do that.

Although I'm partial to a SPROC, I do not deploy them because I understand my colleagues might throw me from a window. But without going full tilt DB-as-the-application,

The DB can make much stronger guarantees about transactions and updates the closer that logic happens to itself. In the world of cloud computing, this can be a cost savings for ingress/egress too.