I have never had a trailer sway after about 5 owned trailers. The only sway I have experienced was towing a truck backwards on a tow dolly above 55mph.
Make sure you need it. Sure, it is going to maybe be safer to have sway control, but it is more safe to wear a helmet to drive, so consider priorities here.
Did you tell us your trailer and tongue weight? If your truck can adjust for payload automatically through airbags then that eliminates part of the reason to have WDH. If your truck can handle the tongue weight with no issues then that eliminates the other half.
I used WDH when needed, but it is so much nicer without it.
