The biggest point I've noticed with online anti- J-36 discourse is that all criticisms completely ignore the existence of the J-50.
Even aside from treating warfare as a nation vs nation affair, far more than just a single model of weapon, they don't even take into the account another weapon of the same type and generation that is expected to be fielded alongside it, and more importantly the doctrinal and technological reasons behind why the additional weapon exists in the first place and was revealed at the same time.
Every weakness of the J-36, perceived or actual, if not covered by itself is instead covered by the J-50.
- "They couldn't use two engines so they had to use three, ergo bad Chinese engines" -> J-50 has two engines
- "Its massive and won't be maneuverable" -> J-50 is similarly sized to J-20 and its shaping suggests enhanced maneuverability vs J-36
- "It won't fit on a carrier so can't project power globally" -> See above
- "Its can't dogfight" -> See above, not to mention 5th-gens and CCAs, not to mention dogfighting may be historical now
- "It will be (extremely) expensive" -> See above
You can tell if someone is approaching a J-36 discussion with an anti-China nationalist bias in mind if they have a gaping knowledge hole where the J-50 should be.
The fact that the USAF revealed NGAD (uncertain if original or just the "mini" variant) was going to be an F-22 replacement is a shocking admission. The J-36 was not built as a competitor to the F-22 (that's the J-20) or its replacement. The real mirror to NGAD is the J-50, which makes you wonder what F/A-XX is and if America has a counter (or even doctrinal concept) to the J-36 altogether. Critique of the J-36 seems to come down to trying to fit it into the F-22/NGAD's role, which it isn't trying to do.
Aside from the little rant, my prediction is that the actually smart folks over at the Pentagon will redesign NGAD to be a J-36 competitor and leave the F-22 replacement to the F/A-XX (which might need a name change). Assuming Musk doesn't pull the funding rug from under their feet.