Stock firmware often has sub-optimal jerk and acceleration settings. Updating to a newer version (or a community build like Marlin) allows for smoother movements, reducing ringing and ghosting on your prints.
Yes. But it requires completely replacing the screen or running it headless. You need a Raspberry Pi. This is advanced. For Klipper, you flash a custom klipper.bin to the STM32 board and bypass the LCD. tronxy xy-2 pro firmware update