Socamm is all about data centre capacity. It starts at 128GB and you can only order it in bulk(?) from data centre providers.

On the other hand I can go to a local store and buy a stick of 32GB lpcamm2.

There's no reason they couldn't use smaller capacity modules. SOCAMM has better area efficiency and z height, both highly relevant for thin and light laptops.

There's a big reason they shouldn't do that though: Laptops have already standardized enough on LPCAMM2 for the modules to be widely available.

The form factor is only a tiny part of the RAM module price. DRAM already isn't compatible gen to gen so you might as well go with the most optimized form factor

I agree, competition and economies of scale are much larger factors. Custom RAM SKUs for a single manufacturer with no competition will obviously cost more than an industry standard part. And you'll be locked to buying RAM upgrades from framework themselves.

SOCAMM is a jedec standard nvidia is already shipping in several products.