Isn't this actually well-suited for foldables due to the USB placement on the left? That allows a foldable to just out on the upper side of the controller rather than the lower side (as with most right-side-usb controllers) where it awkwardly just into your body. The GameSir X2S is the only plugin/passthrough controller I've found that has this nice orientation with my Fold 6.
Lenovo has unveiled a new telescopic controller for smartphones and tablets. Priced at ~$25 in China, the Legion GamePad G3 comes in two colours with Hall effect joysticks and pass-through charging support.