I played Congressional about 7-10 days before US Open when Rory won.
Rough was perfect. USGA, thinking rough would be too thick, cut it. Then DC had a drought. Completely changed the course as there was no longer a penalty for missing fairways.
Oakmont greens are always super fast. No need to make them lightening faster.
The local greenskeepers are best positioned to set up course for the tournament. The USGA should have input, but need to say in their lane.