S Rank Invulnerability Window Please

[Jojoya]

That's totally fair.
What do you think might be a more appropriate answer?

Give the S ranks a buff that ignore damage taken over X amount per hit, scaled to reflect attacks that would be appropriate for that expansion's level cap.

As an example (and I'm just throwing numbers out here at random, real number are no doubt different), if the most potent attack at level 70 would hit for 30k damage when the player is using ilvl 400 gear (Augmented Scaeven), then give the Stormblood S ranks a buff that "absorbs" the amount of an attack over 30k. A level 80 DNC could have a Technical Step deal 160k damage but the Stormblood S rank HP would only decrease by 30k.

For ARR S ranks, maybe that number would be 1500. Any damage over the amount a level 50 player would be capable of doing in 130 gear (Augmented Ironworks) would be negated. Maybe HW would be 10k at 270 (Augmented Shire)so damage over 10k is negated.

Players don't have to be leveled synced so they can use their normal attack rotations. They'll just deal less damage. They also don't have to be standing there doing nothing while waiting for those who arrive late.

And SE doesn't have to completely reprogram how the Hunt works. They just need to add the buff to the S ranks.

One of the other problems with using a Vuln down immunity is that you could be standing there waiting and still miss out because you took your attention away from the S rank for the wrong 5 seconds or because a Wulgaru sleeps you before you get your attack off and it dies before the debuff is removed. ARR S ranks melt incredibly fast right now and HW will melt just as fast next expansion if power creep continues at its current rate. You're not going to miss out if you look away briefly with this type of buff because it's still going to be alive.