I understand what you are saying, but when there are additions and scrambling of the headers in a digitally transmitted signal, they are more vulnerable to distortion when the signal is not optimal.
I am familiar with several DMR/Trbo systems that have suffered voice degradation when using Enhanced ENC, and with loss of range when RAS was added. Maybe in a saturated, multi site area, you don't notice it, but in a rural environment, it is quite noticeable.