To be fair, it's up to debate how much it should.
J-16 is a rather independent thing, which in flanker terms is more of mix of UB(J-11B) and Su-30 (Su-30mkk) features.
Super-MKI...like, let's take Virupaksha for example; it has a very unusual, rare configuration:
	
	
	
		
		
		
			
		
		
	
	
it rotates, aka does horizontal scan mechanically. Only one other fighter radar does similar thing. It just happens to be Bars, and it was done because NIIP back then couldn't get electronic scan right, and had to compromise.
It's totally reasonable that IAF adore this extended scan capability (which with proper electronic scan can reach up to ~270 degrees); extended sector of modern Ru flankers is indeed a major advantage. But it's still exact same configuration, which will most probably introduce exact same reliability issues.