It can be an advantage, it also has downsides though. LPDDR5 is fairly slow as far as GPU memory goes, and on Apple Silicon it splits the bandwidth across the entire chipset. Many recent Macbooks have dGPU-tier hardware constrained by Wintel-laptop memory bandwidth.

And if Apple uses DDR5, why not CAMM? If Apple uses NVMe, why not M.2? Many of the advantages you've listed are marginal compared to the real-world constraints of the hardware, and cover up some boneheaded decisions that don't significantly impact the laptop's efficiency.