There are many clones/copies, not just Chinese ones, the product itself is open hardware under the
GPL license, so free for anyone to reproduce, copy or modify, and therefore not a 'rip-off' if someone other than the original inventor makes it, however good/bad a job they may perform on that copy.
This whole 3D printing hobby is about copying, improving and making it cheaper/more accessible, economies of scale are always going to kick in at some point, having only one supplier of an item is a monopoly and the same as closed source.
I can dispose of half a dozen Chinese J Heads before I am close to the cost of a "genuine" one, which may very well last 2-3 times as long as a copy.
As far as I can tell all hot ends are prone to clogging due to dust, etc, yes you can try and avoid this with a piece of cloth, better filament, etc, but ultimately they all clog at some point. The more you clean, the looser the fit on re-assembly, it is plastic against metal after all and won't last forever. Cleaning the threads on the PEEK usually requires re-tapping which again makes it loose.
Most of the issues I have experienced have also happened to just as many people who have "genuine" hot ends of various types, all you need to do to prove this is look around the web for the types of issue mentioned.
Why do you think the "genuine" J Head is forever being 'improved', it is currently on Mk 7-E and MK 8 from a development viewpoint as can be seen
here, this implies they still have not yet reached perfection and it still has room for improvement.
I was merely offering advice based on my experiences which the OP can choose to take on board or ignore as they see fit, I am not seeing any additional helpful advice from yourself in this regard.