HQ-11 and -16 are different tiers though; 11/17A are on a similar level.
Well, that depends on the variant of HQ-16 in question (the earliest HQ-16 variant and HQ-11 gets pretty close to one another).
But ultimately the difference in launch vehicle size, mobility, layout, and launch setup are the most significant differentiators. HQ-11 is far closer to HQ-16 than it is to HQ-17 in that regard.
If HQ-11 was also mounted on a single vehicle that was able to accompany maneuver brigades and also to fire on the move then I'd certainly agree more with it being an "upscale HQ-17".

