In my opinion, the J-10 is the best aircraft in China's military industrial history, it's much more important than the J-20. Versatile, cheap, easy to maintain, high combat performance, this is a great aircraft. There are many who think that J-20 is better than J-10 because of its invisibility, but don't forget the F-117 lesson. J-20 and J-10 are like Tiger with T-34. It would be even better, if China developed a special version of the J-10, similar to the F-35B role, operating on aircraft carriers.
Thank you for sharing your opinion, you wisely point out some the J-10's strong suits, and I agree with you it is a great aircraft. #1 the J-20 is not invisible, with proper optics you could likely see the J-20 at 50 kilometers. It is L/O, or low observable, with shaping and coatings designed to reduce its radar reflectivity, and in the case of the F-35 and F-22 nozzles and structure to reduce the heat signature that would be visible out to around 50 kilometers or a little better on your IRST, as a result the J-20, F-22, and F-35 have much reduced radar and IRST signatures, they have lot of other advantages,,, but lets stop there.
Now you encourage us to "remember the F-117 lesson", the F-117 proved very, very effective at striking targets in heavily fortified anti aircraft environments, however due to the F-117 following the same track in, night after night, so after putting all the pieces of the puzzle together an F-117 was indeed shot down during the "Balkan Conflict", pilot ejected and was rescued, ONE F-117 was lost out of all the actual combat missions it ever flew, a LOT of combat missions..
Finally and back on topic, you wish that Chengdu would build a STOVL version of the J-10, comparable to the F-35B to operate off their carriers, I'm assuming you are talking about CV-16 and CV-17? and that would indeed be awesome, but a very complex problem, particularly if you choose to equip the "J-10B" with a lift fan such as the F-35 uses for most of its vertical lift thrust, for starter all STOVL aircraft to date have a mid-mounted main wing rather than the aft mounted delta of the J-10.
So yes the J-10 is a very effective fighter aircraft, in fact if I'm not mistaken? the main flight demo team in China uses the J-10 as its high end bird for aerial displays, but I'm going to seriously object to your assertion that the J-10 is a better airplane than the J-20...
I'm gonna take a leap of faith here and imagine that nobody who might meet the J-10 in a mano-a-mano aerial combat is sweating bullets every moment of every flight, but somebody who might indeed encounter a J-20?? he's concerned, he's thinking about it, he's doing his DACT training and taking every opportunity to "game it out", and put together a plan that might help him emerge victorious or at least be able to "bug out".