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You'll have a choice. It will just be locked down at the time you select your CPU model. If you want to add capacity, then maybe you can get a laptop model with a CXL memory slot.
And those "CXL slots" can be in the form of M.2 slots or a next-generation 12VO successor which can be used for anything that can use an x4 slot besides memory too. Expansion isn't going away any more than it already has, it is just taking a different form because extra memory's performance isn't performance-critical anymore.
 
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A Framework-like laptop motherboard doesn't have very much on it. This should hopefully make the actual board rather simple and inexpensive. So, perhaps it should be an acceptable compromise merely to make the cooling solution resuable and offer motherboard modules for sale without it.

Except a real laptop needs to be light, durable, and shock-resistant. Their lab solution probably would make some compromises in those areas. Also, I wonder how much more power you'd burn by not soldering it down.
You also make it that much harder to repair should the MoBo go wonky, and we know that bad MoBo's are a real issue while the CPU may still be good.

Using a LGA Socket, Direct Die Frame, & Screws are a reasonable compromise IMO.

Any good design is going to need holes to attach the cooling onto the MoBo anyways, might as well do a good design from the outset.