It may feel more significant, but the work you do in carrying it is governed by the same laws you otherwise rely on in this discussion. Why the exception here? Because you feel it more when shouldering?
Baffled by this! The exception is because you’re lifting it up and moving it, rather than moving it, with the weight supported by the ground. ???????
I can’t lift up my car, but I can push it along. put another 75kgs in it, would I notice that it was slightly more chuffing hard to get moving? Probably not.
Edit: ignore any or all of that, depending. Lost here. quotes only quoting half quotes, half new but looking the same doesn’t help.
If you want it, buy it. You’ll probably like it.