McIntosh

I'm just curious and I don't think I've ever seen this question asked. I've owned McIntosh equipment for over 20 years and yet I've never seen any discussion as to owners having modifications made to their equipment as is so often the case with other brands. Is the reason because the equipment is so good it doesn't need to be modified, it isn't engineered in a manner which is conducive to modification, it isn't considered "worthy" of modification? I know McIntosh seems to be more polarizing than a lot of other brands so it seems like an interesting topic.