...then those stoves aren't for you.
That's the part I could never wrap my brain around. I don't own a canister stove for that very reason. At least with my camp gas and alchy stoves, I can start with a full tank, and buy only fuel, not cartridges.
Canisters stoves always reminded me of propane torches or gas grills. Not user serviceable.
I own Svea 123, 123R, Optimus Hunter, Optimus Nova (favorite), and a plethora of other gas stoves just for the heck-of-it. Optimus has never failed me. Nor has Esbit.