Funding for NASA isn't unlimited like in the 60s..So there has to be some give and take...
NASA can't spend a lot on low speed flight research, Reduce sonic booms for a future SST and set up a Lunar base with an eye to Mars with the budget it has..
So they will prioritize..with the Lunar program at the top of the save list..
I really wouldn't want to be studying Bumble Bee aerodynamics with NASA money right now..
NASA's budget is a mere pittance compared to two giant black holes called the Department of Energy
and the Department of Education
, both of which should be abolished. If that were to happen (keep dreaming), NASA's budget could easily be doubled and STILL be a mere pittance.