Is sway control needed with electronic sway?

Even with a wdh you still end up a little lower at the rear axle. The purpose of a wdh is to bring the front axle weight back up to what it was without the trailer, not to make the tow vehicle level. Sounds like you will be fine as is.

Note that the 190 like my 179 has the fresh water tank forward and the gray tank aft. So if you carry water like I do that water weight shifts rearward as you use it. That creates a change in tongue weight of about 3% of trailer weight, which is quite a lot, making the trailer more prone to sway on the return trip than the outbound trip. Just something to keep in mind.