Remember that we are dealing with a post-awakening event without, well, awakenings.
It is supposed to be crazy hard. In this scenario I wouldn't consider "unfair" to use one or some of the blessings considering one of the mechanics that existed in DMM at the time they released this isn't here.
I think it would have been impossible for me to clear that map without Sophie (and with a 6/10 skill at that).