the mounting hardware needed for replaceable dimms inherently takes more space on and above the board. the solder approach also gives more flexibility for board

the mounting hardware needed for replaceable dimms inherently takes more space on and above the board. the solder approach also gives more flexibility for board layout, since you don't have to reserve space for the exact size and shape of a standard module. see a teardown of the new blade 14 to see how this can be beneficial. there is an inherent tradeoff between size, battery life, and modularity. if you can make a modular laptop with good specs and battery life, a competitor will always be able to offer the same thing in a smaller chassis or with a bigger battery.