Open sight are quick.
They are reliable.
Practice with them.
When chips are down at less that 15 yards a scope is only in the way regardless of power and you will only need to shoulder and put the front blade on the buffalo.
If he's standing at 30 or 40 you will have the time to hit him well with either option.
Dont sacrifice Top end magnification on a buffalo gun for the 1x emergency idea.
The upper range of magnification is very important to a client hunter (average age 60 years and eye sight is going down for most) 4x or 6x just isnt a lot when there is a sea of black bodies at 85 yards or when a bull is bedding in the shade in a thicket... it happens every season without fail that a low power scope costs a hunter a trophy buffalo because he cant see it.
I want the hunter to see what I see (or more) through my 8x binoculars with 20/20 vision.
This leads to a better chance at a good first shot...prevents problems and is the most important shot.
Very true that these 1x to 9 or 10 or more can do it all. They are pretty new and a good development for dangerous game rifles.
1x capable or not I'll still ask you to take it off when we follow up in 8 foot grass or thick bush!
It's a covey flush at that point boys and I dont see many scopes quail guns