I agree that there’s far more investment in Coruscant than there is Hosnian Prime, but I think that with the finished cut of the movie, if you swap Hosnian Prime for Coruscant, it’s a bad decision precisely for that reason. People would have been mad that a planet they’ve been familiar with for years got like 10 seconds of screen time, then destroyed. I think it would have felt almost like a petty dismissal of Coruscant because it’s iconography from the PT.
Destroying Coruscant would have been fine if we’d seen more of it under New Republic rule in the movie first.