Yeah, that's the thinking. There's probably some truth to it, but having driven new cars nearly every week for the last 8 years, I can tell you that I am absolutely not as comfortable in any of those seats (with maybe a small handful of exceptions) as I am in a 20 year old GM truck....even my Sonoma has great seats. My parents 95 STS, you just melt into the seats, it's awesome. Or a 90's Grand Cherokee with the pillow top seats, amazing.
I am not the only one that feels this way, old car groups are filled with people who long for the days of properly comfortable automotive seating.