As I understand it, the original sin with HDMI was basing it on twisted pair copper. It's just too fragile for such high throughput real time data transfer.
Maybe differential signal processing is advancing faster than video bandwidth requirements, and HDMI will settle down. If not, then HDMI needs a new physical medium. Fiber if it's cost effective and installer friendly enough; otherwise coax.
If it's not simple, it's not sufficiently advanced.