It is uncertain and without a voice from Leetro (which I doubt you’ll ever find or hear) we can never know the intentions of the creator. I feel that the main use case for Leetro Lasercut5.3 and the controller is 1 computer for many machines, hence the settings at the machine itself. If anything I think Lasercut is intended to stand alone with files moving to it primarily by USB stick. It is with the USB stick that you diagnose or update the firmware (or fry the firmware as is more often the case). I suspect the PC controls are for diagnostics and machine setup.
Whilst Lasercut has done great service, I don’t use Leetro anymore for lots of reasons.
As an interesting addition to this case, I did notice some greyed out areas on a setup of Lasercut5.3 which would not allow me to change the size of an object using the resize function. I closed and re-opened the software and could not recreate the issue. Has anyone else noticed this?