Heaps of stuff has RAM soldered - e.g. every single Raspberry Pi SBC, and the vast majority of other SBC’s out there… phones? tablets? IoT devices? And many of these things don’t even have “soldered” RAM - the RAM is part of the SOC!
Anyway - only one bank is soldered, 8 GB - so - I can upgrade by replacing the 2nd bank of 8GB 3200 Mhz DDR 4 RAM DIMM with something larger - e.g. 32 GB - so long it is 3200 Mhz - I still get 16 GB of dual channel (so if I installed a 32 GB 3200 Mhz DDR4 so-DIMM - I’d have 16 GB of dual channel, and 24 GB of single channel - or so I understand from what I’ve read - that dual channel RAM is used by the APU / GPU)… I guess its a single point of failure - hopefully if it ever does fail, outside of warranty - it can be bypassed somehow? Cross that bridge in the unlikely event I need to get across that river…