While there are slight variances in the Dock's background appearance between iPhone models, such as the iPad-style rounded corners on the iPhone X, XR, XS, and XS Max when compared to the rectangular appearance on every other handset, the fact remains that all iOS devices have a Dock background of some sort.
If you’re in the market to do away with the Dock’s transparent background to maximize your Home screen wallpaper’s visibility, then we think you’ll take a liking to a newly released jailbreak tweak called ClearDock12 by iOS developer NoisyFlake.