The data is trickling in at a very slow speed. That data then needs to be analyzed and made presentable to the public. Some of the data is being held so that the science team can write their papers and get credit for the discovery. The final burst of Pluto data is scheduled to arrive at earth in September, more than a year since the encounter.
That is the reason you give to people in polite company.
The blunt reason is that outside of the nerd sphere on the internet, nobody gives a shit about space, engineering, and at least out here in Redneckistan, learning in general. SpaceX nails a rocket landing this weekend and it did not even make the news. I did two outreach events and people who said words along the line of "I like Space" did not know that the second barge landing was successful.
I'm in a bit of a dour mood right now so I will leave my answer there.