The questions are Rhetorical but I'll play along. Gas charge serves to prevent foaming/cavitation of the shock oil and of course, the feature is reflected in the price tag. Also reflected are build quality, material components, research, and brand recognition. Of course, what you were actually asking is do you need a gas-charged floating piston in a steering damper? To which I say "no" you really don't.
Here's my proof. Just for you
@jjvw I took an IR temp gun along with me for last nights off-road excursion. The trail I drove was Schnebly hill road, which is 5 miles of very bumpy, rocky terrain. The rocks are small (4-6") and speeds are 10-15 mph so the suspension and steering take a decent beating. I took the temps of the steering damper, the shocks, and the tie rod (for a baseline on how much heat comes from the engine). Ambient temp was 84 degrees. It should be noted test was done on a 2019 JLUR with factory everything, not my TJ.
at the house. Shocks 84, Steering Damper 84, Tie rod 84
start of trail Shocks 105, Steering Damper 105, Tie rod 106
End of trail Shocks 192, Steering Damper 115, Tie rod 105
The way I interpret the data is while the shocks heated up significantly, nearly 85 degrees, the steering damper only increased 10 degrees, indicating that although the damper is converting movement into heat, probably not enough to warrant a gas charge and IFP.