one of the big problems is runaway costs (and not just due to grid upgrades and need for new transport lines, but because construction is still ridiculously lab

one of the big problems is runaway costs (and not just due to grid upgrades and need for new transport lines, but because construction is still ridiculously labor intensive and undercapitalized), simply put it's at the same time too small scale and complex (and fragmented) to industrialize. only scale can get the same quality for lower price. but construction happens in small batches. even though the inputs are very similar, there's no aggregate market force pushing down costs (as it's not trivial to substitute local inputs with cheaper ones). and to get bigger scale folks would need to accept new technologies and of course new building arrangements. and, obviously, no developed democratic government wants to risk such a big project.