@Enigma If it’s early onto the straight, the attacking driver could still get a big advantage while accelerating. If you both reach 320 km/h, the first person to do so will still have an advantage. KERS is usually left alone in discussions like these, because you can defend yourself, if you still have KERS left. Perhaps allowing DRS to have a defense mechanism would be favorable, if it’s kept in the future, over shortening the zones even further.
Plus, as I said earlier, the FIA needs a good, hard look at what tracks need DRS, where these tracks need it and how to not influence existing overtaking spots. Canada doesn’t really need any, but a track like the Hungaroring could use some help, but not on the overly obvious places. Instead of the usual ‘start finish/other longest straight’, go for something like between 11-12 and 12-13 or something crazy.