Why isn't the market embracing Li-metal solid-state batteries despite 500+ cycles at 80% retention?

QuantumScape's SP2020 prototype achieved 80% state-of-charge retention after 500 cycles... yet consumer devices still ship with Li-ion cells?? How do we reconcile lab-scale Coulombic efficiency (99.8%!) with commercial stagnation? Let's dissect this paradox:

1. Interfacial stability breakthroughs (e.g., LLZO electrolytes) should theoretically eliminate dendrite risks... but 2024 flagship smartphones still use LiPo pouch cells. Is it cost? Scale? Or do OEMs fear thermal runaway liabilities with Li-metal anodes?

2. Compare energy densities: Modern Li-ion ≈ 265 Wh/kg vs. Li-metal's 400+ Wh/kg potential. Yet Tesla's 4680 cells (2023) max at 300 Wh/kg... why the half-measure? Are we trapped in a R&D → production death spiral?

3. Solid-state pioneers like Factorial claim 10μm-thick ceramic electrolytes... but Panasonic's NCM811 cathodes still dominate. Where are the commercial all-solid-state stacks with >350 Wh/kg??

This isn't about incremental gains—it's a paradigm shift. Yet 90% of 2024 EV battery investments flow to Li-ion upgrades. Is the industry waiting for a 'Tesla-level' catalyst? Or are we witnessing a classic case of Kuhnian incommensurability in electrochemistry? Let's debate—am I missing critical failure modes in practical deployment?