Seems great for debugging waterway topologies.

Some things I noticed after a few minutes:

- A lot of smaller rivers system and tributaries seem not to be connected all the way through as seeing smaller disconnected systems with shorter total lengths.

- small rivers that and at the shore geometry of larger rivers but are not connected to the main centerline

- some streams are disconnected by other waterbodies where they should not be, as there seems to be little consensus on how to connect waterways through lakes and other waterbodies, having an unnamed waterway along the centerline connect through the named lake seems to be a good compromise to not mess up rendering but helps with linking up topologies.

https://help.openstreetmap.org/questions/52843/does-the-rive...