I wouldn't say so. I have multiple LiPo's.So you can squeeze more mah into the same cavity as a conventional Li ion?
In my 4 year old BDC stabwood is a 3S Turnigy 1500. Basically 3@18650 each with 1500 mAh.
Also a Turnigy 3S 1300 mAh, 3x1300 (3900mAh) that is the same size and shape as 2@18650 (swappable in my LV efusion Duo)
A fullmax 3S 900mAH (2700 total) same size as a 21700
And finally a 4S 1000mAh (4000 total) capable of 400 watts, barely bigger than my Mirage
The main benefit would be much lower voltage sag when firing.

It was on Facebook and they call them Waffles, I'm all new to this stuff so don't ask me why
Custom 