Two huge variables not mentioned here are whether "weightlifting" includes going to failure or not, and what your state of underlying aerobic work capacity is. IME many people would be better off lifting in a way that avoids reps to failure and also incorporates long-duration low intensity activity like walking with a weighted backpack. Many of the healthiest societies do not do anything we would recognize as "weightlifting" but rather do consistent activity along the lines of construction or farm work (at least before farming became overly mechanized.)
yeah i get you. i usually feel drained mentally when not leaving any reps in the tank. thanks for replying!