To each his own.
However my point was merely that if your intent is to add two pounds to your rifle so that it is easier to shoot well, there are plenty of ounces that can be added that add functionality rather than just extra dead weight.
As to why run an Arca rail AND a bipod??
Kind of goes to your balance issue. With a full length arca rail, I can position my arca compatible bipod anywhere along the rail to achieve my optimal balance. Likewise, I have the option to mount to a tripod for some types of hunting scenarios.
Again though, not saying that everyone should run Arca on their hunting rigs, just pointing out that adding 3oz of rail might be more useful than a thicker/heavier profile barrel to add weight (or whatever else you get to make up the difference in weight between a 7.5lb bare rifle and a 5.5lb bare rifle)
That said... even with your no frills approach, let's take the ever popular swfa 3-9x42, put the ultralight NF rings and a ti base, that is nearly 30oz there alone. Add a couple ounces of a lightweight muzzle brake, ammo sleeve on the stock, and a couple scope caps... you are up to about 42oz... no bipod, no rail, no sling, etc. But all in the 5.5lb rifle will weigh over 8lbs. The 7.5lb rifle will weigh over 10lbs.
Now... I'll nip the next question in the bud... why do I need 3 rounds in the mag plus 8 in the ammo pouch? Only need one bullet to kill your elk right? Well, at least when I hunt, I've got at least one other newbie hunter with me, so between our two tags... thats at least 2 bullets. I also carry two wolf tags, a bear tag, a lion tag, and depending on the situation I could take a coyote during the same hunt. Often our elk hunts overlap a deer hunt... I've never been lucky enough to see all those critters in the same hunting trip... but I just know that the day I leave the truck with just 3 rounds I'm my rifle will be the day I see them all lined up laughing at me from 100 yards away. I might as well have the extra ammo attached to the rifle instead of in my pocket... thus the additional weight on the rifle makes it that much more shootable.