Good question. The term "cutler" is definitely going out of fashion. Who knows why?
The typical definiton of "cutler" is: "One who makes, repairs, or sells knives or other cutting instruments." However, dictionaries are now starting to put "dated" or "archaic" in parentheses next to the definition.
It could be that in the old days you would buy knives from your local cutler and occasionally return them there for repairs. Your local cutler was probably one guy or a family or a small business. Now however, most people just buy knives at a department store along with other appliances and tools. They just throw the knives away if they're dull or damaged and there's no reason to visit an actual cutler or knife store.
If that was the understood meaning of "cutler", it's easy to see why the term is now falling into disuse.
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Cerulean
"My good reason to carry a knife is that God gave me rather weak teeth and rudimentary claws in an evolutionary trade-off." - J.K.M.