This is the “answer” in plain sight and I agree. The iPhone is the beating heart of the modern Apple empire. Tim Cook has been a vocal proponent of AR since the summer of Pokemon Go. That combined with Meta getting traction with their Rayban line is almost certainly at the center of an overarching internal strategy at Apple to ensure they are positioned to maintain or even grow position as end user mobile computing form factors shift beyond the traditional smartphone. Getting the ux and app ecosystem ready visually is what ‘caused’ Liquid Glass.