Almost nothing about a finance system changes from one country to the next. What changes is the statutory surface around it: how a return is filed, what has to be kept digitally, and when e-invoicing becomes compulsory. One page per jurisdiction states those, cited to the government pages they were read from, with every tracked system's own country row beside them.
The alternative is a translated copy of the whole catalogue per country: the same vendor profiles with the spelling changed, competing with themselves in search and doubling what has to be kept current. Stackmark publishes one profile per system and one statutory reading per jurisdiction, and links them.
The list is short because a reading is only worth publishing once we have read the government pages ourselves. A jurisdiction absent from it is one we have not covered, not one where nothing differs.