You certainly make a strong argument here. To reduce the chances of my DB failing is one of the reasons I went with a new Gun. Of course anything may happen, including things outside of our control.
Understand 375 in this case is a adequate back up, no question about it. However I'm not going to Africa this year or before end of next year. I plan to hone my skills first, by hunting locally, US, Canada and Alaska during this time. Would I need a 375 as a back up here, probably not before I go hunting for Grizzlies and Brownies and by then I will have 375 as my primary..
Do you have a 7x57 aka 275 Rigby?
I’ve hunted more animals worldwide with that gun than all others combined.