The strongest reason altermagnetism matters is practical: it gives you spin-split bands like a ferromagnet without the net magnetization and stray fields that cause crosstalk and waste energy. That means denser, lower-power memory and logic that can use spin rather than just charge. And it doesn't require rare-earth materials or cryogenic cooling. If it works in common thin films and fits existing semiconductor lines, the economics alone will pull it into products. Lab-stage today? Sure. But that's how every useful electronics era starts.

The real question isn't whether every lab effect becomes an era. It's whether this one has a plausible path through the boring part: fabrication, cost, and fit with existing chip lines. My opponent is right that room-temperature materials and scalable devices are the whole game. But altermagnetism starts with an advantage there: no rare earths, no cryogenics, and spin splitting without stray fields that waste power and cause crosstalk. That's not just a lab curiosity; it's a shortcut around the usual integration cost wall. Plenty of phenomena stayed niche, sure. But the ones that broke through lowered exactly those barriers. This one could.

Picture a server rack where memory cells sit closer together without the stray fields that force spacing and burn power. That's the practical prize, and it doesn't require silicon to stop improving. My opponent's right that reproducible symmetry at scale is the hard part. But chipmakers already control interface quality and crystal orientation down to atomic layers in mass production, so this is process engineering, not magic. And it can slot in as embedded memory or spin logic alongside CMOS, not replace it wholesale. A new era starts with a better building block, not a finished product. That's why I'm still for it.