Okay, let me humor you then, if their improvements are because of doping what is the ceiling?
after all these are human beings No?
surely the PEDs are bound to kill one of four of them.
not to mention nearly everyone running at the moment is improving.
I think its the Bolt/Rudisha effect, where when one All time Great pulls everyone else to PBs.
at the moment on the women's side we have been abundantly lucky since the onset of Ayana, Genzebe, Kipeygon Hassan Gudaf, Gidey etc.
meanwhile as you hate, Kipyegon jut ran 3.53.99 at altitude in Nairobi
good luck to the rest of them ladies at the Olympics