With the exception of the X1 ultrabooks, I don't think any Thinkpad has soldered RAM. My X1 Extreme Gen1 with 64GB and a family member's P51 (or p53 dont remember) with 128 GB definitely do not. I bought the cheapest RAM tier and put in my own modules as soon as I got it.
Except for ultrabooks where the sacrifice makes sense, I don't expect Thinkpads with soldered RAM to ever become standard. That's just not their target market - their warranties even allow CPU repasting.
OK first i was thinking that must be BS. But your are right and I'm really angry about it...seams that my x250 is my last Thinkpad until they change that BS. I understand it for a superlim thing, but NOT for a T or P series.
Except for ultrabooks where the sacrifice makes sense, I don't expect Thinkpads with soldered RAM to ever become standard. That's just not their target market - their warranties even allow CPU repasting.