I completely agree. So many poignant moments have been erased. I get that Peter and Olivia are the main characters but I don't think the emotional development of the other characters, Walter especially, should be treated lightly. Having an actual child erased, like Faux has, is tremendously important. She deserves to remember. If she doesn't, she's a totally different person. Same with Walter, as I said in an earlier comment. Having raised another Peter, having kidnapped the alt version of his dead child, is a HUGE deal. You can't substitute that experience with anything else, no matter how interesting Amber Walter's predicament is. This Walter we are seeing now is not the same. That's why I feel so disconnected to these characters (except for Peter -who is the same Peter we know and love- and Lincoln -who is new, so I have formed an opinion on him solely based on this season).
I really, really want Altlivia to find out or remember that she had a baby before this season is over. I was hoping that AltLincoln would mention something about Henry as he was dying. He did say he's been blown up before, which shouldn't have happened as it did in this timeline since Olivia never would have crossed over with the other Cortexikids to save Peter.
It's not enough for me for Olivia and Peter to remember the first three seasons. Even if Walter remembers, I'll still want Altlivia to remember her kid, for Broyles to remember seeing his dead doppleganger, for Astrid to remember her own friendship with Peter, and even Walternate to remember that he almost killed his son to save his universe. Without these experiences, these characters aren't as interesting to me.
And when it comes to Fauxlivia remembering her baby, it strikes me as strange/emotionally manipulative that Peter "found out" about lil' Henry but Fauxlivia herself has no idea. Is it more important for Peter to find out about it because he's the lead, so he's the one that matters, and Faux is irrelevant? Even though Peter had no idea about that baby and Faux herself actually gave birth to it and became a mother? I don't know, the whole thing about Henry being born to the "wrong" Olivia has always struck me as insensitive, and the fact Fauxlivia has forgotten that ever happened (or, really, the entire thing was erased, it has not actually happened to this Fauxlivia) is even harsher to me.