The problem is that this has an XBox-style or Switch-style layout with the analog joysticks being diagonal or offset. I just can't seem to find a phone clip-on device of this type that has the joysticks side-by-side on the bottom, PlayStation-style.
Obviously there are plenty of Xbox and Switch gamers and it makes sense to cater to that market to make and sell things laid out in that style.
But there are lots of PlayStation gamers too. Five generations of the living room console, plus the Vita. Plus some other odds and ends from Sony and others that also use this layout.
So why are smartphone controller add-ons in PlayStation-style layout not just much rarer than XBox/Switch-style but in fact all but impossible to find?