I have two Dell xps 13, two generations apart, the newer one is touchscreen the other (older) isn’t. Guess which one weighs 1.3kg and which weighs 1.1kg.
I’ve literally never used the touchscreen.
If they're two generations apart, then 200g difference could be hiding anywhere, but touchscreen (I really doubt it adds even 20g).
e.g. 30g in larger heatsinks, 80g in glass-laminated screen, 20g in larger battery, 40g in more stiffer chassis. 30g in aluminium top case instead of carbon fiber :)
> two generations apart
Maybe that's the reason, not the touchscreen?
> two generations apart
You're blaming the touchscreen for a lot here, when the explanation is likely a lot more pedestrian. Change in case molding, change in PCB size, slight change in battery size...