Let's take Canada as an example. It's correct that tax debts have a limit of up to 10 years. However, this can be extended in certain circumstances. It is also not guaranteed that the tax debt goes away after 10 years or however long it actually ends up being.
So I'm not sure these limits mean what you want them to mean. You need to look further than just the initial limitation. There are almost always ways for tax authorities to extend the debt period.