Oh, but there were too fatties (Troi) in Rodenberry's future, although we might have to assume that they were fat by choice.
A stylistic decision... Hell, it could have even been political to intentionally carry an extra 30 pounds.
Fat is Cyrano Jones or those Zakdorn aliens. Troi was not fat.
I was 11 when TNG started.
From an 11 year olds perspective, she was like a tank!
It was season 5 before I realized that she was short too.
(Just shy of 5'5".)
Now that I am 2 feet taller and three times the weight of the 11 year old version of myself, I'd probably agree with you if I was honest, but first impressions stick.