Mike, please don't blame the bot. Ungluing a node an just leaving it there, is really looking for trouble. Some routing engine(s) glue nodes together that are less than a few centimeters from each other. Now you may want to complain that those routing engine(s) are buggy, but that "bug" has historically made things easier rather than more difficult. And going forward, I expect it to continue to be a "feature" rather than a bug.
Consider me firmly in the "it's a bug" camp. Routers in general work with data from different sources; but it's a bug in OSM to have an intended connection only be close but not connected. There's no minimum node distance for disconnected nodes - just best practices to minimize database clutter from dupe nodes. QA tools like Keepright make it feasible to monitor and maintain large areas in a fully correct topology.
Do routing engines glue nodes from different layers? Do they automatically connect crossing ways on the same layer? Either modification would change the calculated route.
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