I suspect this is an example of us seeing history through a mdoern lens and making false assumptions. For example, the idea that a nation project or an empire is genetically homogenous is a relatively modern concept. The truth is that empires incorporated various ethnic groups and those ethnic groups survived for long periods of time.

The Roman Empire at times extended all the way from England to the Persian Gulf. It included various Celtic people, North Africans, people from the Balkans, Turkic people and people from the Middle East. At no point did these people become ethnically homogenous but they all very much Romanized.

The British Empire spanned the globe.

In more modern times the Austro-Hungarian Empire included a dozen or more ethnic groups and languages.

Would we describe being Roman, a Briton or an Austro-Hungarian as a "job"? I don't think so.

I feel like this is common in most (at least western) empires. Vikings from Sweden would take over territory as far as Poland or even Italy and recruit new soldiers. Eventually some of them would end up in warrior style graves. What's actually more interesting in my mind is that they didn't bring people back, and so the gene pool in Sweden remained more or less unchanged

The OG founders.