Regarding the observation problem: Wouldn't you be able to set up a protocol beforehand (e.g. sample the photon at X MHz) and then you know your window for when

Regarding the observation problem: Wouldn't you be able to set up a protocol beforehand (e.g. sample the photon at X MHz) and then you know your window for when the other side would have had the chance to observe? Isn't this how a lot of time division multiplexing already works? For me the bigger issue with quantum computing is that I just don't believe it will ever be practical. Feels like we've been seeing this same article for the last 30 years. I'll love to be proven wrong.