TL;DR; you may have noticed that bunch of new countries (beside original Germany, USA, England, Canada) now have regions. The idea is to split up even more countries. There are no formal rules what to split or what not, but it is more case by case and what makes sense as far as beer drinking goes. Aka there is no point of splitting up Afghanistan to regions as it doesn’t offer any value for a beer site. At the same time it makes sense to split up Belgium to regions as it is very famous and quite diverse beer country. Most countries fall between these two extremes, hence there needs to be discussion about whether they need to be split, and if yes then how to split. Usually locals have a better insight especially about the second part - sometimes ISO/Wikipedia/etc info doesn’t make sense or is straight up wrong.
