Well, I was confused when I posted that, but there's actually a whole
   padding infrastructure set up that appears configurable somewhat.
   [1]https://github.com/torproject/torspec/blob/main/padding-spec.txt
   With some review a proposal could theoretically be made to make things
   constant-bandwidth for those who have the patience and bandwidth to use
   that.  The min-max times are consensus parameters and they describe the
   distribution.
   I'm not a privacy expert, but I can compare two matrices of bandwidth
   usage changes, and wouldn't be able to if they weren't changing.

References

   1. https://github.com/torproject/torspec/blob/main/padding-spec.txt