The maker is by no means the whole thing, nor anywhere close. Maker is just one more attribute. Show me a knife maker (with experience and with numerous knives on the market, not a two-knives-a-year type) who has never sold a knife that got resold later and has never sold a knife that had some kind of problem.
Comments on individual knife makers often focus on one special thing that they do very well, whether it's their skill in judging and executing certain grinds, a certain pattern or category of knives that they've become known for, their skill in steel selection and forging, or whatever. That's because nobody is best at everything. Knives from experienced, highly knowledgeable, highly skilled, even revered makers are criticized all the time, sometimes for technical faults and sometimes for unsuitable characteristics. People often buy knives and then sell them, and frequently it's because they "bought a maker" but the particular knife they received didn't match the reputation.
A knife that is perfect by blind luck is exactly the same as a knife that's perfect through a lifetime of study and work. It's extremely unlikely to happen, but that doesn't matter, because what does matter is the lesser, weaker version of the same thing: A knife that's good enough by luck is still good enough. When a "mystery knife" is good, you don't refuse to use it until you find out whether the right person made it. (unless you suspect it's an irreplaceable historic artifact, or would be worth a million if only you didn't touch it)
Choosing a good maker improves your chances. Choosing a good steel improves your chances. Expecting a good maker to know the right steel to use is smart, but choosing a good steel and finding out which makers use it is smart too. If "buying a maker" makes sense to someone, then "buying a salesman" ought to make even more sense to the same person, because a good salesman knows the makers AND the steels AND the customer satisfaction levels for all of them. But in the end, none of them can substitute for using the knife and finding out for yourself.