Not that I’m trying to change your mind, but I think it helps some people if they have a goal with weight lifting. Oftentimes, that goal is to get stronger, so it’s a chance to compete with yourself each time; did I lift more weight, or maybe lift the same weight but more often?
Of course, as has been noted many times in this thread, there are other, perhaps better ways of “testing yourself”, such as by doing your exercises with a varied tempo.
Also, trying to maintain perfect form can pay off by directly targeting the muscle you are working. It can be rewarding to feel that direct stimulus on the target muscle.
I can’t stand manual labor. It’s not that I’m too good for it. I just don’t usually like doing it. It either triggers my allergies or I’m just not dressed right, and so I’m just miserable.
Give me a gym session where I go all in for 45 minutes, and come out exhausted and dripping witn sweat. But please don’t make me use a shovel or unload a pallet (I’ve done both)!