J-35A, unlike the J-35 for PLAN, is actually not needed for immediate service.
China won't be exporting the J-35 but the J-35A is probably not needed when the J-20 is being built at upwards of 100 annually. I think you would see the J-35A needed in numbers in the PLAAF once the J-10s are being retired in large numbers.
That's wrong.
What China does need right now is actually plenty more 5th-gen fighters, given the worsening geopolitical and military developments in the WestPac and over the Xizang Plateau. We're looking at not-a-small-number of non-friendly countries surrounding China with growing and prospective fleets of both 5th-gen and 4.5th-gen fighters right now and for the foreseeable future, let alone the ones from faraway. China certainly needs both quality AND quantity to build and maintain at least a slight (if not significant/considerable) advantage/overmatch against her expected opponents.
And by being smaller and less top-tier-ish (compared to the J-35), hence relatively more affordable, the J-35A fits the bill quite well.
If anything, given how the Guancha Trios noted that Chengdu AC is already scraping the celling WRT J-20's production capacity sometime last year - I'd certainly see Shenyang AC joining in being a sight of great relief, given how Chengdu AC won't be as pressured as before, since they would no longer be the only ones hard-pressed by the PLAAF for 5th-gen fighters.
That means instead of having the PLAAF relying solely on Chengdu AC for ~100 J-20/A/Ss as we are right now - Chengdu could gradually reduce their J-20 production capacity to ~80-90 J-20/A/Ss per year, whereas Shenyang AC could gradually increase their annual production rate to ~40-50 J-35As per year for the PLAAF, plus another ~10-20 J-35s for the PLAN (provided that the immediate 5th-gen needs onboard their CVs have been dealt with).
This also means that the spare production capacities at Chengdu AC from the reduction of J-20 production could be dedicated for the production of other warplanes types in the coming years, such as mid-tier and high-tier UCAVs, plus even the upcoming J-36.
The benefits of the J-35A's addition to the PLAAF's fighter fleet can never be overstated. Besides, who's still going to happily boast about procuring many 4.5th-gen fighters into the 2030s and beyond, if they can totally afford a majority-stealth fighter fleet?
As for the J-10A/B/C family (plus the J-11BG family) - While some of them could still be flying around in rear units and doing rather menial tasks (like chasing away opposing aircrafts, patrolling along land & maritime borders, and conducting strike missions when regional aerial control is secured), I certainly wouldn't be surprised if more and more of them are sent for the aircraft boneyards in Western China in the future, even if they still have 10, 15 or even 20 years of life left in them.
As for the past habits - China is getting wealthier. So does the PLA.