I'm definately not disputing that they can and do get 4+ feet in the wild and even in ZOO's, I've just personally never seen a REAL 4' RTC in a tank.
I've seen and owned 3 footers before, and in person they are HUGE

Its not the length thats awesome but the width

They are truly huge.
I guess it bothers me when someone asks how big do they get and what size tank is needed and every Guppy keeper on the internet says 4+ feet and you better have a 1500 gallon tank or else. Thats simply not true. Sure they need a big tank, but more importantly they are a high maintanance fish, needing large frequent water changes and a varied diet. I very rarely see this mentioned.
Sorry to sound like an ass, it just gets fustrating to me because i've been trying to grow a 4 footer for years...........AND CANT