I also use up the partially-spent canisters for car-camping, unless my gram scale tells me there's enough in there for a particular trip.
I come from white-gas stoves and arrived at Canisters with a view based on exposure to the Bluet stoves that, in my experience, reliably failed over and over for others around me in the snow, at Camp 4 in Yosemite Valley, in Kings Canyon...etc. I upgraded to an XGK and kept that in service for many years. Although I recognized it was large when packed, it never fails, puts out plenty of heat and fuel was simple. Canisters looked wasteful and "doubtful", too.
Alcohol stoves were my next stop, but only a brief one as I was thoroughly bummed with a skilled buddy's stove performance in cold, blustery weather and realized that this genre is too slow and too finicky for me. Even though I love the MYOG aspect of these stoves, I want horsepower and a larger hammer.
It was a Pocket Rocket that blew me away and led to to look hard at canister stoves. The Optimus Crux I wound up making my "regular" puts out heat like the XGK, lights instantly and easily without priming, doesn't soot up anything, and with a cook kit, full canister of fuel, spork, lighter and windscreen weighs the same as only the stovehead of the XGK.
I punch holes in the empties with the Jetboil prong tool and recycle them along with other metal cans, so the "waste" is neutralized, at least in reference to other fuels, etc...
Being able to crouch down in blowing, 40f rain and put together the stove, fire it and boil water for coconut water tea to warm up my hiking partners, in about 3 minutes total even though I'd managed to get chilled and was shaking... is something I couldn't do with either the XGK or any alky stove (not to mention my emergency hexamine). Others might have no problem, but "a man's got to know his limitations", ha ha!
For me, the canister stoves are lighter, faster, stronger and *better* than any other options for a reliable cook system. Reviews that demonstrate how light some of the new stoves (like that FM 300t or the 117t's I just bought for Patrol Stoves) are, just cement that for me.