Soldered RAM is such a bullshit. I don't care about saved space. Heck! I could even cope with bigger smartphone if it provides easy way to increase RAM in form of a module, etc. Same, obviously, for a computer.
But I do realize that most people are not tinkerers and care about superficial and cosmetic shit like "it's lightweight and slim". They will never understand, nor they care about the fact that this comes at a price [literal and as a side effect]. You get worse performance, frequent overheating, no upgradability, etc.
I am always ready to pay more to get exactly what I need, like possibility to expand on my own hardware in the future. Maybe there's a niche for people like me, because I know I am definitely not the only one.