isnt the prevailing issue with solid state is that they're both expensive to manufacture AND they have a short lifecycle? (ie the lifespan of a solidstate is about a 1/4 of a NMC and even less that of a LFP)
Solid state LFP batteries, having no moving parts, is supposed to last longer and be more energy dense than traditional lithium ion, though we'll have to see what it is in practice.
