I use Swann Morton #3 handles with #10, 10A & 11 blades
They have a hierarchy - new blades are used for cutting decals & canopies; then for cutting & trimming parts; then rougher work like scraping, & applying filler
I only ever use new blades on decals & canopies, but sometimes I will re - sharpen blades for general work, so it takes a while till the blades are finally discarded
Then I tape them up, wrap in thin cardboard, tape again, and put them in the general non recyclable bin
I have Stanley knives, but not for modelling, another of my hobbies is leatherwork. Mostly I use fixed blade leatherworking knives for that, which are meant to be re-sharpened, but I also use a Stanley knife sometimes
I re-sharpen the Stanley knife blades for that, in fact they seem to be better when they are re-sharpened, probably because it reduces the shoulder of the bevel, and polishes them.
Even new Stanley knife blades are better after sharpening & stropping
I also use Stanley knives for general work, so again, I re-sharpen them and I don't often throw them away.