Hi,
As I already shared in last discussion about this topic, I agree with keeping and fixing "logging level all" instead of dropping it and creating a new command, because imho most if not all users of "logging level all" in config files expect the fixed behavior (set each category to level X). Dropping and adding a new command is going to add far more breakage than fixing it.
Having said that, I don't want to spend more and more hours in discussions regarding this topic, so I'm fine with whatever fix you want to do as long as current misleading behavior disappears. Have a look at the patches I submitted if you are interested in a similar fix.