All these disparaging remarks! Oh my!
First, the Fw190A5 may have a decent WEP climb rate when light, but the climb rate drops with the MG/FF, and the A8 suffers horribly when compared to it. The Ki84 may "match" the 190A5 in climb rate, but overall is a much much better dogfighter.
You might as well say the Fw190A5 is superior to the A6M5b. Surely it is in some areas if you compare only the specs, but as an overall dogfighter, the A6m5b is far better in most ways. The same is true with the Ki84. I've flown both the 190 line and the Ki84 extensively in my AH career. I'm not saying the 190s are bad (and please note I still love them), but I am saying that a 190A5/A8/D8 comes up against a Ki84 and it'll be dead (unless it's a D9 and runs away with superior speed).
Food for thought: Very few planes in this game break 4000 fpm climb rates. Top 10% probably. The Ki-84 is one of them. It floats on a stall with full flaps down to 80mph and less in a dogfight. It can out-spiral climb almost anything in the game. It has rapid fire 20mm guns that can kill almost anything in a single hit. Not sure where all this plane bashing is coming from. It's a damn good plane.