Fateha For Dead Ones
You’re right Wasif Sahab! Surah Fateha relates to the person reciting it, and also it relates to the person who is alive and is asking for help and strength from Allah to stay on the right path and to further solidify his beliefs. There is no sense in associating this dua with the dead ones. Instead, the duas narrated from Prophet Muhammad (sws) for the dead ones are very relevant and have divine wordings in them w.r.t their appropriateness and relationship with the situation at hand.