Support passives only kick in after 2 seconds from the last time they take damage

Mauga, JQ, and now Hog have DOTS

There are only a few dps heroes (widow venom mine, sombra virus, Ashe dynamite) that have DOT abilities, but I’m expecting to see a bunch more in the future, to combat “support creep” (which is mostly immortality and mobility creep)

I’m all for the support passive kicking in after 3-5 seconds so that they can’t just strafe and hide during duels - yet can still be smart and useful during teamfights and have SOME sort of longevity/survival

My question is, if we keep getting heroes/reworks that have DOT effects, what is the point of the support passive?