I think there seems to be a misunderstanding as to what “Eremos” is. Literally it means “wilderness”, “deserted”/“desolate”, but this is not an absolute. In EB it first was used not for an “impossible to conquer” region, but an “undesirable to conquer” region. The innermost part of Arabia used to be a region with capital at Dumatha, but this was merged with Eremos (and Dumatha removed from the map) for the simple reason that it neatly avoided the Seleucids/Ptolemaioi going after the Saba quite so quickly. It happens to make sense with the idea of it being a desert, but in antiquity it contained some key traderoutes and major cities as well.

In EB 2 we reshuffle the provinces with an eye to making them trace relevant cultural/geographic boundaries better and fix problems with the way they are distributed and what we need/want to get out of that. Although it looks odd to see parts of Ireland as Eremos, it happens to make a lot of sense given the very minimal human presence it enjoyed. Note that even wooden settlements leave relatively clear traces which modern archeology is accustomed to deciphering (for instance rubbish dumps, changes in the soil which used to be a hearth, concentrations of animal/plant remains, pollen), otherwise we'd know a whole lot less about for instance North West continental Europe, Skåne, Northern Germany, Poland etc.