When the joystick moves the spool, what happens is the ports that allow hydraulic pressure to flow to the motor are opened.
The further the joystick is moved and the further the ports are opened the greater the hydraulic fluid and pressure flowing to the motor and the faster the function is performed.
"open" and "closed" are absolutes. The valve is one or the other.
If the valve is "opened" it could be partially or fully open. Your second sentence emphasises this by saying the ports are opened further.
buggles (not a teacher)