I have been seeing a lot of users this last week claiming that Earth-Prime people are the same as Earth-1 people. They aren't. These are fundamentally the same characters, sure, but they are not the same. If they were, the citizens of National City (and the world, really) would not see Lex Luthor as a good man, and he would not be running the DEO. Winn-Prime is the new Toyman, but Winn-38 would never become that in his life. Sara Diggle would not exist. As we see in the promo for the next Flash episode, Iris is acting differently, which wouldn't be the case if she were the same person. Laurel, being originally from Earth-2, will need to have a different past to justify her existence considering she is still alive.
When Lex made a deal with the Monitor, he only asked for one thing: that Lena Luthor to stay alive. And she did. That's why there is no Lena from Earth-Prime, because we still have the same Lena from Earth-38, albeit with a different past, like all the Paragons now have.
And I know, all of these characters probably aren't going to have enough of a difference to them that we should think of them as different, but that doesn't mean that they aren't different. It's like how we have a separate page for Mick Rory from Earth-74 even though he acts identically to Mick from Earth-1. He is a different character with a different history
At the end of Crisis part 3, the entire multiverse was wiped out. That means that every single person ever was dead with the exception of the Paragons, Oliver, and the Anti-Monitor. They went back to the Dawn of Time before a multiverse even existed and then made and stabilized the new multiverse. They didn't bring a single person back to life, it completely reset the multiverse with new histories, new characters, and so on.
Besides, even if you don't want to believe this, the admins have already come to an agreement on the matter, and you're not changing their minds considering the process of this decision is already underway.
If you ask me, I think this mindset should also be applied to a couple of time remnants, particularly the version of Hunter Zolomon who posed as Jay Garrick and the remnant of Barry Allen who became Savitar since it is somewhat similar to this. But that doesn't really matter.
What I'm trying to say is that you should accept this change. It is confusing, it is weird, they're still largely the same characters we know, but it doesn't mean the admins are wrong in their decision.