The smaller F-22 is a fighter-bomber so why can't the larger J-20 be one too? -SP
The YF-22 was (originally intended as) a fighter-bomber. Probably would have been a very good one indeed. The F-22A is more of a kludge in this role, although still probably more capable than a lot of aircraft designed from the outset as such.
nope, the ATF was intended from the start to be a pure air combat machine, like the F-15's it was replacing. "not a pound for air to ground".
the J-20 just isn't a very good design for a bomber. small weapon bays, which would limit it's bomb load to the lightest air to ground weapons. wing/canard/tail design best suited to high speed manuevering, but less apt at low speed. (bad idea for a bomber..look at the Luftwaffe "ground attack" F-104's for an example.) and no fittings for designator systems to guide smart munitions.
not to mention the fact that the company that built it is currently in the process of refitting the J-10's in service for the ground to air role.
no, the J-20 is probably designed as a fighter. probably more of a Mig-31 style interception style fighter. high speed, able to reach, shoot down the enemy, and return quickly. just what the chinese need their aerial interdiction offensive doctrine and their defensive doctrine. they've got J-10's and J-11's for air to ground.