The whole system of scaling is that it requires time and accounts to set up, simply allowing you to choose a scale for something like this when the raid has already been made easier and is let's be honest, cox is barely a challenging bit of content, would just be making the raid easier and require less effort to set up.
If scaling was ever to be introduced would be capped at 3-5 max, and should be applied to "full" raids.
Things that would be more beneficial to the game overall would include adding the missing parts of content with the raid itself, including attacks and mechanics. Developing and working on the challenge mode version of the raid, in which you would be rewarded more points for completing the harder full version of the raid and overall would be more beneficial.
