Alderaan said:
The only reason why the Hosnian system seems to matter is because we are told it’s an important place, but unlike Alderaan, we are not shown it’s an important place in relation to our characters and the plot.

I disagree there. While I’m not sure which character said it (only saw it once), but I believe C3PO said that the Honsian System was where the New Republic and its entire fleet was housed. This plays big into the plot because now, there’s a huge power vacuum. We can deduce that the entire armada of the First Order wasn’t on Starkiller base since Snoke’s reaction was more “bring Kylo to saftey” and less/non-existent reaction of “Shit, my whole army is vaporized!”

So therefore, the destruction of the Honsian System showed how the Cold War-esque era is now over and puts the galaxy out of balance. It’s probably reasonable to assume that the First Order will have more of an advantage, numbers-wise.