Sorry to that post in wrong thread, it is actually belong to here.
https://www.dsdarchive.com/wads/njdoom
e1m8 have quite big horde of 34 demons in the exit room with 11 effect, which was intentionally skipped by current fast/max IL runners, but as perfectly proved Revved in his E1 max movie can easily (with big enough stockpiles of rockets and health) be killed even without invul. And that invul gives max/fast runners alternate and solid method to kill all those demons, however costing a some time for backtracking.
At first look here is nothing to debate: if solid method of doing 100% exists then runners should do it. But for second - what about other categories? Should be separate exception maked for Tyson, which has zero possibilities there? Or quite exotic Tank category which are simple not fast enough to arrive before invul wears off?