I personally don't see why the precise beliefs of Arians changes anything.
Perhaps ... but the fathers quite rightly did. It has a profound implication with regard to the whole understanding of Scripture.
By way of explaining how we perceive it as important, imagine an imam were to preach that it was not
actually the angel Gabriel who came to Mohammed in the cave, rather the angel was an expedient device employed to assert the source of the Quran is divine inspiration, rather than the fruit of purely human creativity.
They were non-trinitarians.
Not quite. Arius did not believe in what came to be defined as the Doctrine of the Trinity, but he did believe in the Father, Son and Holy Spirit. He did baptise in the name of Father, Son and Holy Ghost. For Arius, Jesus was not quite God, but he was not quite man, either.
They did not invent a Homoousian trinity.
LOL, no-one 'invented' in that sense, the Niceans proposed a
Homoousian (Gk: of the same substance) explanation of the relation between the Father and the Son, the Arians proposed a
Homoiousian (Gk: of a like substance) explanation.
Arius' teaching spawned a number of alternative theologies, semi-arianism, etc., etc..
They were persecuted by the Nicene church.
And the Niceans were persecuted by the Arians!
The Homoousian victory at Nicaea was short-lived. Arius was exiled, but despite the Council's decrees and Constantine's wishes, the controversy continued. Constantine allowed Arius and many of his supporters to return to their homes. Athanasius was exiled, though he was later recalled (he was exiled and forgiven around five times!). Arius was restored to a full communion. Some scholars consider that Arius may have been poisoned by his opponents. Whatever the cause, his death did not end the controversy.
Constantine was baptized on his deathbed by the Arian bishop, Eusebius of Nicomedia. Constantius II, his successor, was an Arian sympathiser. Arianism reached its high point in 357. Following Julian the Apostate who sought to restore paganism to the empire, the emperor Valens, an Arian, renewed the persecution of Nicene bishops. Valens's successor, Theodosius I ended Arianism once and for all among the elites of the Eastern Empire through a combination of imperial decree, persecution, and by calling the Second Council in 381 in Constantinople, condemning Arius and affirming the revised Nicene Creed.
Arianism survived among the non-Germanic peoples of the Empire.