If one is home-bound (aka hunkered down in a fixed location), I agree. The earth, not ones back, shoulders the additional load.
However if one plans, or is forced, to be mobile-- where ones' back must shoulder/carry the load imposed by ones' choices -- there is a lot to be said for "two firearms, one caliber" thinking.
WARNING: Henceforth there be speculation!
Hypothetically speaking, should events place me defending a fixed position (particularly if said position includes a relatively high place), I'll take a scoped .308 bolt-action over nearly anything else. Prospective interlopers won't get closer than about 700-or-so yards.
On the other hand, if I'm hauling aspirations across disputed territory, a scoped bolt-action .308 is more of a liability than an asset. In this case I'd prefer a pistol-caliber rifle or carbine that matches my handgun...
"That's my opinion; oughta be yours!"
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