I don't think there's a ton of use distinguishing between "the GOP" and so-called "Trump MAGA". Certainly a lot of former-republicans have become disillusioned, but it's not like that caused them to move left, or indeed vote any differently at all, as far as I can tell. There's nothing in particular that MAGA says or believes that is a break with tradition for conservatism, it's just more than before (an escalation which I fear is going to hurt us when the democrats have absolutely not matched it in any way).
You're right that discussion is impossible with them, but I mean. The strat before was to shift the conversation to something so abstract that it was impossible to reach an agreement anyway. That's "protect American jobs", "war on terror", "lower taxes". It's not like most of the voters changed their minds when that became "keep the Mexicans out", "Muslim registry" and "obliterate the middle class". It's harder to stay friends with people who are always saying the quiet part loud, but the quiet part hasn't changed much. Pundits and politicians are riding the reactionary wave because it gets them money and power, and that's what they've always done. It's certainly become scarier, but that's as much as anything because the Democrats are not fit to match them. At-best they're pretending all the old euphemisms are still what's being fought, and at worst they're moving further right themselves.