The lead writer said that the characters personalities and their relationships are purposefully based on their gameplay aspects. This is a practice in storytelling as a way to better ground your character. It’s almost a law in video game storytelling, and overwatch is no exception to that.
You can see this in most of relationships depicted in the lore. Brigitte is close to Rein and their abilities in game compliment each other. The same goes to Soldier and Ana, Ana and Rein, Roadhog and Junkrat, Genji and Zenyatta. You also have aspect of rival characters being counters to each other in the game. Ana and Widow, Tracer and Widow, Genji and Hanzo, Soldier and Reaper, Moira and Mercy, McCree and Reaper, Doomfist and Winston, Tracer, Genji.
It goes to a point that they even added voice lines to indicate some of these relationships as to indicate a gameplay combo. For example: Ana has never interacted with Genji in the lore, but more than 1 year later after she was added to the game, they gave them a voice interaction as if they knew each other well.
Pharah is the only character they’ve been purposefully avoiding any type of lore that is related to that. Pharah’s character identity is almost inseparable from Mercy’s, in both gameplay and development(Pharah’s name used to be Mercy). But in this new story we see they obviously circumvent any type of relation this two character might have. They’ve doing this for years now.
Egypt, more specifically, the place where the Anubis facility is(Giza), is one of the places that is most mentioned in the present lore. We had Doomfist and the Omnic leader there during Storm Rising, Mercy was said to be going there too after the mission. Sombra mentions Helix, and was probably there during Old Soldiers helping Reaper(she was mentioned). Ana lives there and met Soldier that was hunting bad guys. Moira in mentioned in Bastet( and I guess Valkyrie too). Baptiste is said to be going there after his short story.
The last we got about Pharah was the mention about Ana’s letter to her. You know the thing that Ana talks about in her origin video from 2016.
I find it funny that people use the defense that “It’s Mercy’s story”, “Pharah has nothing to do with her”. But none of you said anything when the Bastet short story came out and it was as much about Soldier as it was about Ana. New characters were introduced in Baptiste short story and nobody complained about them taking away his importance.
The Temple of Anubis is Pharah’s map. Imagine if you had multiple stories taking place in Junkertown but it was about Moira and no mention of Junkrat or Roadhog? Wouldn’t it be weird? Pharah is the security chief responsible for the facility in Giza. They mention Helix, it’s soldiers, the temple, the Raptora suits, but not mention Pharah. Like people said before me, Ana could have made a short mention like: “The Raptoras are being deployed, watch for Fareeha.”; “If you see my daughter, please make sure she is ok.”; “If you see Fareeha is in trouble, warn me.” Them not mentioning Pharah was just because they wanted to avoid any connections between her and Mercy, simple as that.