With respect, I beg to disagree.

Needing a chain that can shift into the big/big combo safely isn't an option, it's a requirement.

Regardless of plans or intent, shift happens, and the consequences of accidentally shifting into a combo the chain can't loop are too dire to be an acceptable risk.

Many of us routinely set up gearing beyond rated capacity, but it's SOP to run the chain too long, so it loops big/big, and is slack in small/small. That way the only consequence of accidentally shifting to an unusable gear is a chain that sags like a pregnant possum's belly.