I find the explanation and process for merging lists a bit confusing.
“Merging”, means taking 2 and making one. Like highways we all drive on every day. 2 lanes become one. One is eliminated.
However that option doesn’t seem to be an option. That takes one more step, or two more steps to delete the 2 originals. So that option needs to be available to. At least that’s the way I view merge. 