I would expect that within EEA most of the regulations would be the same and I don't think it's the problem.
What you would need though is translated manuals and such by law. Maybe even localized support for warranties that could raise costs to enter a market.
This is only my assumption, but it would make sense, that's why they cover even smaller English speaking countries like Ireland. Or for example Germany is a big market, but they cover Austria too, because they have German language for free.
There must be a simpler way. I can buy any other electronics parts internationally, why not laptop parts from the Framework Marketplace? I also wouldn't mind buying as a business and skipping VAT and consumer protection. There's no import tax for computers either.