Joint start over all categories

Although the concept of a joint start is nice, especially for events with fewer contestants, but it seems to favour heavy riders in the lower categories who produce high absolute watts.

Whats happens is that right after the start these riders are able to stay in a pack of A-riders and get minutes and minutes advantage over other D and C riders. During a climb they be overtaken but will still manage to find a new group again of A and/or B riders.

My proposal is no more joint starts over all categories
1st group A riders
2nd group B riders
3rd group C and D riders (most of the time the group of D riders is limited and there is not that much difference between C and D)