>which upgradable memory module format could be used with the same speed and bandwidth as the soldered in solution

CAMM perhaps? The modular memory is important, because they are selling them to two different markets: gamers that want a small powerful desktop, and people running LLMs at home. The modularity of the RAM allows you to convert the former into the latter at a later date, so it seems pretty critical to me.

For this reason alone, I am going to buy a used epyc server instead of one of these desktop things. I will be able to equip it with a greater amount of RAM as I see fit and run a greater range of models (albeit at lower speed). The ability to run larger models slowly at a later date is more important than the ability for me to run smaller models faster now. So I am an example of a consumer who does not like framework's tradeoff.

You would think that they would at least offer some type of service where they take it into the factory and refit it with new ram chips. Perhaps they could just buy used low-ram boards at a later date and use them to make refurbished high-ram boards.

Another solution is to make it so that it supports both soldered and unsoldered ram (but at a lower frequency). Gaming is frequency-limited but does not require much ram, but a lot of workloads like AI are bandwidth limited. Hell, if you're going to have some high-frequency RAM irreplacibly soldered to the motherboard, it might as well be a chiplet!