The problem with that argumentation is, that the supposed "midcore" content is only "midcore" for a few key people, i.e. tanks / healers and dps that can rezz. Everyone else can just kick back and isn't really responsible for anything beside a faster clear time. And if there is one thing all the discussions about the low skill of the player base and the amount of dps that don't AoE in SB+ content have demonstrated, is that "other people's time" is not something that is worth anything to a majority of the playerbase. The whole point of failed mechanics penalizing the whole party and hard enrages is precisely to equalize this disparity in responsibility. A dps not doing the mechanic correctly => not enough damage to clear enrage => dps needs to do the mechanic properly like everyone else, not watch netflix on 2nd monitor while everyone else is doing all the work for them and they just get all the rewards anyway.
I mean, the duels in Bozja are 1v1 encounters, surely, that should be a "midcore" player's wet dream, right? Just the midcore player, the boss, no one to rely on but one's own skill, no one that could mess with the attempt. Except that means there is also no one to carry said "midcore". And despite there existing cheese strat, in the hundreds of hours I spent in Bozja, the number of people that would fall into the "midcore" category skill wise that have attempted the easiest one (Gabriel) I observed were around 2. The rest of the "midcores" were just people who spend time in the area, but still died to nearly every CE. Red Choctober, the big carrion bird, the laser tree, the math robot, the spidertron. Every single one of them regularly flooring 30 ray people.