You or any DIY other person can still do it in “more flawless form”. What or who is preventing that? No one force anyone to use e-ink. There are a myriad of display technology available.
Can you please explain what do you mean by this?
Very unclear. Accepted by who? By what?
Technical details please. As this is simply not true.
The HDR-DDR mode uses double data rate signaling on the SDA line with a 12.5 MHz clock to achieve a 25 Mbit/s raw data rate (20 Mbit/s effective). Wikipedia quote
So the I3C speed is not the limiting factor neither is the only communication available to TOH.
EDIT:
Who brought it? Source? To my knowledge there is no TOH available yet.