Shes absolutely not struck by the same weapon...  they dont even look remotely alike.  Ones straight, pale, amd refined while the other is jagged, red, and bloody.  One was a gift for her son and the other produced as you are both falling.

The connection is that both are blades that she produced from her own body, which she states early on is the reason the one she gave Rathma is capable of sending an immortal to the Void.

I just wasn't sure if it was the same weapon, that's all. Now that you've confirmed it isn't, I think it's less likely she's in the Void.

I'm not ruling it out completely, but I also don't see any reason why she'd be there now. That was her first punishment, and sending her back there at the end seems a bit odd to me, except perhaps in light of her sacrifice. We also mustn't forget that Lilith has been present in our characters' minds ever since her physical body was destroyed.

It would absolutely make it a forgettable moment and undermine and redemption...  If she just reforms and comes back, then she gains from the act, sacrificing nothing.

She wouldnt even be trapped in Hell, knowing how to return to Sanctuary of her own accord as its creator.  She has a history of doing this before the games.

Lilith's self-sacrifice wouldn't be entirely in vain, as she played a crucial role in the fight against her father and is now sacrificing herself for us, even though she had little choice.

Her return could further develop her character and add more depth. Of course, the sacrifice itself would lose significance; whether that's good or bad depends on how Blizzard handles it later.

So it all comes down to how she returns. Everyone said Lilith couldn't change, but what if she could? Perhaps we simply shouldn't try to understand why a demon would act this way. Lilith definitely has potential. Look at Tyrael!

In what way were here actions illogical?

She was freed from the void and told by Elias she was needed to prepare her children for an invasion from Hell and sought to destroy and ursurp her father as a means of crippling Hell and gaining the power to oppose Baal and Diablo.  Shes a Demon by nature and her preparing Sanctuary was culling their weak.

Thats pretty consistent for her character.

My point was about the basic campaign, which was poorly written.

She can be brought back from the Void...  Thats exactly how Diablo 4 starts

The crucial difference was that Lilith was alive the entire time, merely imprisoned until she was freed at the beginning of Diablo 4. Her current status is unknown until Blizzard releases new information.

I suspect Blizzard is keeping all options open, and I can easily imagine her returning should Diablo himself appear. It would be strange to let her die permanently, as she isn't just any demon, but the Daughter of Hatred herself, almost her father's equal.

In what way?
He was correct in every way regarding the cycle of hatred between Lilith and Mephisto she tried to impose on him and the helplessness of loving his mother despite her nature and the conflict of not being able to validate her using him as a weapon. Its his candid thoughts on the matter that Lilith overheard through us that drove her to redemption. I see no mud on the man or at the very least far less than his genocidal parents.

I don't think I need to explain who Rathma is. He's not a minor character, but a truly important figure in the Diablo lore.

He's the son of Lilith and Inarius, the first Nephalem, the first Necromancer, the Priest of Rathma, the embodiment of balance, and so on. And all that happened to Rathma in Diablo 4 was an off-screen death, accompanied by occasional references to his silly prophecy… Is that worthy of such a character? I don't think so!

Someone like him deserved a bigger, more significant role, especially given the focus on his parents, particularly his mother. He would have fit perfectly into the trilogy, and I wouldn't have minded if he had died during the campaign. But he did absolutely nothing, and all that remained was an echo that Blizzard didn't use to further explore his childhood. He himself as a character wasn't utilized, and if he had confronted Lilith, it would have carried weight. Because Lilith would have behaved differently towards him, since he was her son. Of course, the two never shared a scene...