I don't use neck straps, I don't any holders, just my hand on a grip of the body, zero neck pain, and my setup varries between 1.5kg to 3kg+. On the heaviest side, my upper back starts to show some complaints after longer time of shooting. But I don't use that setup often, otherwise monopod would be introduced.
Photography
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This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.
never had any pain, but my telephoto alone weighs more than your setup there, and many professionals will shoot for more than 3h
Get a Spider Holster and carry it on your waist.
Not everyone is a concert photographer OP. Some people are nature/landscape who need to hike for miles to take their shot. Others are event photographers who need to be quick on their feet to get to where the action is at.
Also not everyone has a healthy pain-free body. If you've injured your neck, back, knees, wrists, or are just older, but you still love photography, you want as light a kit as possible.
Just because you've "never" experienced any discomfort, doesn't mean other people haven't.
My heaviest hike was few hours with 10kg backpack with gear. I did it 3 days in a row, and took some nice photos.
Next week I'm going for 4 days, but reduce my load to ~6kg.
”Hauling” 1,6kg lol. You’re probably not carrying a third of the weight that the people with neck pain are, and I bet those people actually work full days too. Amateur flex.
One of my lenses weights 1.7kg, with the full size body it can already get some weight then.