Setup Tax Codes for different countries in one Regime

Hi, i´m at a customer which at the moment maintains Tax codes for many different countries in one (migrated) Regime.

Do you think this could lead to issues when it comes to Tax full functionality and reporting?

I was thinking about defining tax regimes per country under the one Operating Unit / Legal Entity so the applicable regime can be derived for some smarter tax calculation.

What do you experts think about this idea? Maintaining one Tax Regime or creating new ones per country which are all assigned to the one regime?

Thx