the stiffness of the keyboard deck and entire chassis, even the X series (I used to have an X1 extreme) had significant deflection in the middle of the keyboard

the stiffness of the keyboard deck and entire chassis, even the X series (I used to have an X1 extreme) had significant deflection in the middle of the keyboard deck, poor torsional rigidity, and an ewaste quality display compared to an M1 Pro MBP