Derailleur shifting takes a few seconds to learn. For gods sake it isn't rocket science.
Briefly let up on pedaling and shift. Try not to shift going up hills. Don't shift when about ready to stop.

Your counter argument for the clutch item is strange. If you know how to drive a clutch you know how to drive a clutch. The double clutch technique is unrelated to said argument.
Likewise if you know how to shoot a gun, you know how to shoot a gun. You may be a terrible shot but you still know how to pull the hammer, aim towards something, and pull the trigger.
At this point you are splitting hairs to make your argument stick.