I don't really either. But also don't see the point in not having him. I don't think he really makes it anymore Slayer, he doesn't write and he says he wants to try things he couldn't do in Slayer. But I can think of a few drummers that would excite me more. Charlie is a great drummer. but he also has bad carpal tunnel in his wrists. Sometimes I wonder if that's why he doesn't write a full on thrash record anymore.
Newstead would be a good choice background vocal wise. But he's always talking about his back and his neck and shoulder. If he were a horse he'd be put out to pasture

I think John Tempesta would be a great choice and I'd love to see him leave the Cult lol. He can full on as well as anyone but also has taste and swing. And hell lets get James Murphy on that second guitar! Then it really won't sound like Slayer