Irish-language literature is "almost entirely based on irish history or culture"? Incorrect. You really should read more of it or perhaps ask questions of the people you hear coming out with this stuff as you appear not to have a grasp of the facts.
There are many works of literature in Irish that do not discuss Irish history or culture (I really don't know what you mean at this stage with either of those words, it could be anything). Please be advised that there has been a conscious shift away from the 'traditional' milieu in Irish-language poetry and prose since the '60s.
But does setting an Irish-language novel or short story in the past or in Ireland or -- God forbid -- the Gaeltacht really detract from whatever magnificent and universal themes might be treated therein? It would be nonsense to mock
Ulysses, as Myles na Gopaleen did in jest, for being nothing more than a "tourist guide to Dublin". (Speaking of which, it occurs to me that for all the opportunities offered to them as writers of an international heavyweight tongue, the English-language writers of this island have been just as Hibernocentric as the Irish-language writers.)
As regards writers in other languages, there are plenty of Irish translations just as there are in English. Where's
War and Peace set?
The Red and the Black?
100 Years of Solitude? What histories and cultures are they "based" on? Did they only become worthy when translated into languages that have nothing to do with Russia, France, Mexico?
As regards your point about academic works, well, minority languages the world over are in the same boat and Irish is nothing special in having a limited audience. You seem to wish to disregard the enormous body of academic publications in Irish that might have anything to do with the slightest whiff of linguistics or history, so I will just note in passing that there are also many that discuss political and theological questions of general import. Current affairs and eclectic discussions on matters of human interest have platforms in print, on the television, on the radio, and on the internet. Do I listen to or read them if they don't interest me? I don't as I am not arsed. Do I if they do? I do.
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