There is also no Join Walls command but that seems to have been a requested feature for 15 years or so

There is: select two walls and right click. Select "Join walls". If the function doesn't appear in the context menu or the join fails this means that two the walls are either already joined or can't be joined because of a weird angle between the walls.[/quote]

I select a wall, use Split Wall. Then I shift select the two parts of the wall, and go look for the Join Walls command. There isn't one