And you're ignoring Occam's Razor, why?
The simplest, most-logical explanation for those
features are what?... Mike?...You got a better more logical answer
than what JPL's scientists give?
Hey!
Liquid absorbs radar signals at certain frequencies,
giving a "dark" radar image.
Liquids [any liquid], undisturbed, certainly appear "smooth" in radar imagery.
That's no surprise to anyone who knows anything about radar.
Also....
It's cold enough on Titan's polar hemisphere
to liquify methane.
What other evidence will satisfy your intellect?