Yes what I have learned so far is that the air ride systems are designed to carry a load of 200lbs or more or otherwise ride harsh.
If by air ride system you mean Legends, etc: That has not been my experience, nor have I heard or read that on this forum. I'm 180 pounds, and they ride fine for me. You do have to find the sweet spot for your weight and that of a passenger and/or gear, but that applies to other shocks as well. Still, there are more-conventional shocks that ride better, so the main reason to get air ride is to slam the bike down for easier "walking" to park, etc.
OTOH, if you're referring to the Harley air-adjustable shocks, then you may be right.
If you do a search on "legends air suspension," you'll get several posts that discuss them; also, Midnight Rider has used them extensively and written about his experience.