Two out of about 3500 is not actually that many https://osmose.openstreetmap.fr/en/issues/graph.png?country=australia%2a&item=1270

The almost junction test will be looking for things like a corridor that end within 10m of some other highway as they might be errors. In this case it isn't, so noexit is to flag that it's OK.

What determines if a room is routable is the software you'd be using.