You are right Joe. This is a very rational and factual point. I too do not get the ammunition holder on stocks, but there is no arguing that adding a scope and mounts typically adds between 1 and 1.5 lbs depending on how compact and recent the scope is (latest ones tend to be smaller and lighter).
This one is more personal. Objectively, of course, a 10.5 or 11 lbs rifle is heavier than a 9 or 9.5 lbs rifle, but what effect this has on the hunter is deeply personal. I personally carry my rifle German style, on a sling on my left shoulder, rifle under my left arm, muzzle forward and upward; plus a small "possible bag" backpack (water canteen, first aid, headlamp, spare batteries, etc. etc.) and I am utterly incapable of distinguishing whether the rifle on my shoulder is 9.5 lbs scoped or 11.5 lbs scoped, whether after 1 hour or 10 hours walking. Conversely, I shoot noticeably better a heavier rifle that I find easier to steady on the sticks or off hands. I am sure that it can be the opposite for others, so I do not think that there is objective right or wrong regarding this item, just subjective preferences.
Entirely agreed Old Friend. The rifle a shooter is likely to shoot best is the one the shooter likes and trusts, regardless of whatever opinion anyone around may have. In this case since both rifles are fully capable I do not think that the choice would have any bearing on the success of the hunt...
A personal philosophy...
I do not have several decades of experience hunting Africa, but I do have several decades of experience hunting Chamois on foot in the French Alps in conditions that are - in my modest opinion - much more trying for both equipment and people (I was/am a registered Mountaineering Instructor, graduated from the French National Alpinism School in Chamonix, so I tend to hunt Chamois where few people go); and I do have some experience with floatplane drop-in wilderness hunts in America/Canada where there is no 'back-to-the-shop' plan B when things fail. I learned the hard way to eliminate as much variables from the equation as possible. This is why I have come to prefer unbreakable kevlar over wood; integral scope bases over screwed-on bases; non detachable magazines over detachable ones; steel over plastic; and yes ... CRF over PF; etc. no matter how rarely they fail...
One can safely call me a paranoid, near obsolete and over romantic dinosaur, but I like to play it safe and I end up loaning my rifle, flashlight, first aid kit, compass,spare batteries, paracord, rifle toolkit, spare rain gear, optics cleaning kit, etc. a heck of a lot more often than I need to borrow anything from anyone. I kind of like the feeling.
Granted, most of this is essentially irrelevant in modern pampered safaris where indeed more time is spent in the truck than in the bush, so most of my cautionary facts (with or without "") are likely extraneous, and my risk mitigation useless, but it gets hard to teach old dogs new tricks...