Unhealthy VEX devices

Every V5 motor has a build-in PID controller, which is really difficult to disable. For this PID, P is too small, which leads to slow accleracte. And the P/I/D parameters cannot be changed. So you will find it very difficult to add a custom PID.
The remote controller and brain wireless connection is not stable. For competition use, that is enough. However, for uploading program, sometimes error will occur, just replug the usb and reupload.
For debuging, the received data will include lots of noise and wrong message. So do not connect controller while debuging, directly connect the brain or use the brain screen to show the feedbacks.