I’d like to propose enabling the Variable to Table Column node to replace existing columns.
Reason is, sometimes variables are not populated which would result in varying table specs which can be tricky to keep consistent (Extract column header, filter missing, add and sort missing columns + ensure column type compatibility). In combination with loops that (yet?) not support varying table specs, like the Variable Condition Loop End, it would be a nice improvement.
In the following screenshot an unexpected, albeit reasonable, behavior was observed leading to this suggestion.