My Reviewers...
Ask awkward questions about the rate of erosion and transport for these features we claim to be active at present day, and ask "If these were active over all of Mars' history, how big a hole would they dig, or how far back would they erode a scarp."
A significant question, and one that everyone must answer to fit into the chronology of Mars. Most claims of active recent stuff don't permit the surface to be as ancient and unaltered as it it is today, so there is a reality check missing from most analyses...