One thing we see fairly often is masonry that’s still solid overall with one section beginning to fail.
Maybe the mortar is opening up around part of a brick wall. A few bricks on the chimney are deteriorating. Concrete near the porch has cracked or shifted. Those are different problems, and they don’t automatically mean the entire structure needs to come apart.
Michigan weather does have a way of making small problems more noticeable over time. Water gets into an opening, temperatures drop, and repeated freeze-thaw cycles keep working on the same area.
That’s why the first question usually isn’t, “How much should we replace?”
It’s, “What’s actually causing this?”