Most everyone with a loader has probably had the problem... you disconnect your loader and then later on you cannot get it connected because pressure has built up in the lines. Most folks just press in on the coupler tip to vent off some fluid and off you go.
I noticed that newer Kubotas have reversed gender hydraulic connections for the loader. Meaning, they have the male fittings on the tractor and the ends of the hoses have female couplers. I started thinking maybe that system was better and less likely to leak when disconnected.
Then today I was watching a video of a guy with a Kubota trying to reattach his loader after being stored for winter and he couldn't get the couplers attached. He was able to easily relieve pressure on the tractor side by moving the joystick. But... with female couplers on the loader side there was no tip to press and the only solution was to loosen the couplers and vent some pressure. No pressing the tip against something and no fancy tool that works.
I'm glad JD kept the female couplers on the tractor side.