This hasn’t always been true, look back in the day, there were dozens of dev posts. Right now, they have been focused on developing core features which are not yet ready to be revealed yet. Still I agree I miss the interaction here on the forums that used to take place frequently.
I maintain the Overwatch Blue Post Directory to give a complete archive of all developer responses and I have a pretty good idea on the goals and intentions of the Overwatch Development Team. One thing to remember that even if the goals and intentions of any feature, hero balance or development goal were one thing back in the day, they are still subject to change. So while looking back to past developer responses is good, just know not everything remains certain and there is perception to certain things such a hero balance that should not be taken overly strictly.
To be bluntly honest, this happens in every game’s online open community (forums/Reddit/Social Media/etc.).
So yeah, I too would love more dev responses these days, (even if simple ones), but I am hopeful their absense is a sign of great things to come.