User blog comment:Kogath/Monster Hunter XX Discussion/@comment-5963861-20170330172914/@comment-17735225-20170331140055

I just realized why all the later deviant quest have to be in these special area, even if those are questionable/dont make much sense.

These special area prohibit trap usage. Thats why no g5/super deviant quest happen in forlorn arena at all.

Imo I think they already made enough mess in monsters habitat in Mhx/gen already so it doesnt come off as a surprise.