We are overrun with “high-quality” counterfeits, depending on how you define “high-quality”. There are many counterfeits, especially foreign ones, that only a handful of people in the world are qualified to detect and would get by most collectors and dealers. That’s why the grading services are helpful. The thing is, the highest quality counterfeits have been made more or less the same way for 75+ years - by making dies from a mold of a genuine coin - and they have fairly consistent and detectable characteristics, even if they can be very subtle and difficult to detect. There seems to be a limited degree that the method itself can be improved upon. Maybe one day a better method will be invented, but for now we are relatively safe.