It's hard to ignore decades of interlocking economies combined with worker mobility. The draft UK EU exit agreement concluded on 24 December 2020 (here) largely takes up the existing EU rules on social security scheme coordination for mobile workers, marking an appreciable advantage for companies as well as for citizens moving between the EU and the UK, since they will be able to continue enjoying a certain number of social protection rights. However, separate rules from those in force within the EU are provided for as regards the posting of workers (‘posted workers’). Furthermore, the agreed coordination protocol will only be applicable for 15 years.
By maintaining a system of coordinated social security schemes, the EU-UK draft exit agreement (here) avoids hindering worker mobility between the United Kingdom and EU Member States in so far as it simplifies and secures the management of migrant staff from a company perspective, while essentially cancelling-out the impact of moving within the EU for those citizens who choose to spend part of their careers in other countries.
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