Even if Beskar is supposed to be light his old armor was probably durasteel or something else heavier due to the Empire making a shortage of it by stealing/harvesting/whatever you want to call it all the Beskar they could.
Also like they said in their tags, nothing is that light so while it’s probably the lightest Star Wars metal it still weighs something.
I was at the gym training punches with 5kg halters and a ideia started forming in my mind
Imagine Din and Luke are on a mission together, something to protect Groggy (as usual) and Din HAS to take off his armour for a reason, and then they encounter some stormtroopers and have to fight their way out, but Din is armorless, you would think he is vulnerable, right?
WRONG, he IS NOT, he is surprisingly more of a BEAST then normally, so fucking fast and strong that the imps have no chance against the two of them.
BECAUSE HEAR ME OUT, Din has fought armoured his entire life, THAT AMOUNT OF BESKAR HAS TO BE AT LEAST A FEW KG + You lose mobility with armour! And he learned how to adjust to the weight and everything, so now, without it, he is so fucking faster and stronger that is almost inhumane.
He is helpless because he can't really move like a real person anymore after years of walking around wrapped in metal.