I think folks are forgetting the variety of what gets called 'hiking'.
The more you carry the slower you move.
At one extreme, I've done climbs where you pray like heck that a storm doesn't hit because you're not carrying enough clothes to survive a storm, and I've shivered through the night on ledges with only a polypro shirt and rain jacket because that's all we could carry and we didn't finish the climb before running out of daylight. A couple of years ago we ran into a PCT thru hiker who had averaged 37 miles per day from the Mexican to Canadian border. His pack, excluding food, weighed 18 lbs or something like that. A 7 pound rifle wouldn't be light by his standards. In fact, a 10 oz J frame wouldn't be either.
Even in more normal backpacking, the only things I carry that aren't potentially life critical are a digital camera (4 oz?), sometimes a paper back (2 oz?), a water purifier (8 oz? - not immediately life critical, but can save some nasty trots), and perhaps the stove (although it's sure been welcome a time or two). I really sweat whether to take 6 ounces of mittens or an 8 oz extra pile jacket - and if you're in the Wind Rivers and a late Aug storm dumps two feet of snow and drops the temps to 10 degrees, those can be pretty important. I have come close to dying twice in the wilderness, and both times it was from hypothermia.
I'm going light because I like to be traveling up and down off trail at 10 to 12 thousand feet, and cover a lot of ground - every doggone ounce matters.
At the other end of the spectrum, if you're hiking in 5 miles on a flat trail to spend the weekend at a lake, there is a different set of tradeoffs. By all means, take the air mattress, Super Redhawk, and a bottle of wine
.
Lastly, I carry only the six rounds - I'm expecting at most one bear attack, and no one is growing dope above treeline. But if you did run into a grow op somewhere and the people there didn't want you to make it back to the trailhead, it might be nice to have rather more than six rounds.
Horses for courses and all that. Some people saw their toothbrush in half but still carry the espresso maker. Some people figure 'why carry toilet paper when leaves are available'. There aren't any right answers; only right answers
for you.