There are ARM CPUs available, but they are mostly for servers or very low end devices, there's not a lot in the pro laptop market, and even if a low-end server chip could be repurposed, I don't know if the brand recognition would work, customers know AMD and Intel and what they're getting in terms of performance at different specs. That all works differently with ARM.
And then on the software side, Windows support seems... partial? Linux support is much better, but selling a laptop with only Linux as an option is a big step down in available market, and even Linux struggles with compatibility sometimes.
Apple's ARM chips are the only mainstream laptop/desktop class chips, but that's a completely distinct software and hardware ecosystem that neither Framework nor anyone else have access to.