Sorry everyone, but modular RAM is on its last legs
Performance requirements vs. the inviolate laws of physics are pushing not just towards soldered RAM, but SOC RAM.
The possible happy medium is external CXL RAM, which will be considerably slower than integrated RAM, but nowhere near as slow as flash. This will require significant OS-level support, but since it will be a server thing we may see it trickle down to the desktops (definitely for Linux, possibly for Windows, Mac users shouldn't hold their breath).