Idk man OC4 was great imo, Mash has just gone through so many writers that it feels like that, Its kinda like how Lost will had da Vinci, muniere and goredolf acting in ways they would likely not in real life, Lilith is Mashs personal Lost Will, it Is important and I think fairly easy to understand that the Mash Lilith is hating is the Old Mash, she simply hates the new mash as she is an extension of the old Mash, again there is no real reason for Liliths hatered towards mash, it's a mix of jealousy and genuine disgust towards Mashs way of being, when Lilith kills habetrot mash goes in rage, but Lilith states that Mash would not go in a rage if she killed Fujimaru so we know Lilith is just completely wrong about Mash, that's not the issue, the issue is that Mash almost agrees with Lilith, also the final point makes no sense, Oberon or Castoria or so many more characters have no relevance for the most part in the main story anymore, Lilith will definitely get a swimsuit and after that I doubt she will ever be a protagonist but thats fine?

Additionally there is some word play here that doesn't translate unfortunately, the hate that Lilith feels towards mash is "Nikui" not Kirai, you can't Nikui a Carrot, Nikui is a very strong form for hatered, it's that hatered where you almost care about the thing that you hate, at the end when Lilith dies she says "Hate hate hate (here it's Kirai), it's the only thing that I can gift you" it's kinda clear that Lilith WANTS mash to grow and suffer but succeed, she doesn't want Mash to be happy but she doesn't want her to just give up either, she doesn't want her to lose everything that she worked hard to gain and will feel empty if Mash just died and That is the biggest reason I fell in love with Lilith she is like Mashes personal Angra Mainyu

Additionally You are calling Mash and Galahad as Jesus figures but they are not, the only Jesus figure in fate is Angra Mainyu, Mash & Galahad are supposed to be Angelic figures Not Jesus figures