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Re:New Lenovo ThinkPad Range with Ryzen 4000 and 4000 Pro Mo... by jpalomaki on Thursday May 07, 2020 @03:38PM (#23107262)
I believe Intel had some limitations on their support for the LP-DDR (low power) memory and that's why so many systems had the 16GB limit.

On light road-warrior machine like X1 they likely wanted to maximize the battery life. And supporting many types of memory on same model was not likely an option.

Re:New Lenovo ThinkPad Range with Ryzen 4000 and 4000 Pro Mo... by numpad0 on Friday May 08, 2020 @08:02AM (#23113775)
Memory power consumption is overlooked but real, and they increase as capacity increase, so if customers aren’t going to use up it makes sense not to offer too much capacity.