If a person has the ability and skill to cut tubing to the proper length and join them together in any manner, then they should be able to learn how to braze. I've seen some steel parts brazed together with and put through stress tests and the material itself failed before the brazed joint failed. Steel doesn't require as much skill to weld or braze as does aluminum along with all the considerations you have to make for its particular characteristics for handling loads.
And I think visually there are more clues when a braze isn't correct than when a glued joint isn't correct.