I agree with you. I recently replaced 3 other rifles with an M1A for that very purpose and reason. My main purpose for a rifle of any kind is SHTF. Here in FL, we are "shall issue" so a .45 takes care of personal protection.
I got rid of 2 5.56 weapons, which I had for short to intermediate range, and a bolt action in .300 mag which I had for longer ranges.
My match type M1a has the quick multi shot capability of the smaller weapon , as well as the range (at least most of it) of the bolt.
If the SHTF, do I want to fiddle with or drag around an arsenal? Let's see, let me select this one for this situation. Oh, there's someone popping at me from a longer range, better get out the other. For me, simplicity is the way. The one rifle will do everything within the limits of my skill. I'll assemble one set of support parts, and one caliber of ammo ( a few different loads, but obviously all will work in the same rifle). As far as survival, yes it will work for that, too. While I do not hunt, and would do everything I could (including survival vegetarianism) to avoid harming an animal, I am a realist. If it came down to it, either personal danger or starvation, the 7.62 will put down what I need to.