Why can’t they trial this in US ? There are literally thousands of cities without fiber and locked into crappy cable connections.
Poor connectivity in the US is a political problem, not a technical one. Google Fiber tried to solve this by getting cities to make permitting not terrible with mixed results.
Correct. Lawmakers in your state have to take steps to clear the way for broadband. Otherwise lawsuits fly when rent seekers gouge whomever has right-of-way when data services try to come through. Also, utilities have to be forced to get off the dime. If they're required to offer non-discriminatory access to poles and trenches, for instance, then they either seek to operate the broadband service themselves or come to terms with someone who can. Otherwise they behave like it's 1975 forever and squat on their power lines.
Also, having the fiber mounted lower on the pole means one can repair one or the other in isolation.
The FB method seems like it could be dangerous for repairs, but I would like to see it applied in real life, too.
So, legal and liability issues.