It's not ideal - but you can get good discussion out of it provided you bear in mind that you're dealing with generalisations and that indivudal variation tends to be high.
Taking the house analogy, you couldn't assume a London house to be £300k, but if you assumed that a terrace house had a neighbours attached to both sides you'd be right most of the time. The end terraces would be an exception, but so long as you said "most" or "this is often true" or something, I think it should be fine.
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