While i like the idea to teach new players the new mechanics/markers added, i think guildhests are not the way to go. They were underutilised in ARR so much so the msq forced you through majority of them in patch 2.1(since has been changed), let alone now.

Personally i would prefer that to gain access to SB and onwards content you have to go through an intermediate novice challenge where it goes through all currently used consistent markers, why i choose SB onwards is due to HW starting to unify them but it still has oddballs yet to be consistent (1st stack marker in msq is Nidhogg in Final Steps of Faith etc).