To be devils advocate. Arabic did not keep us united. There are many sects among Muslims , is that sign of unity ? Muslim countries waged wars against other Muslim countries is that sign of unity ? Muslim ummah does not have consensus on major issues of the world , is that sense of unity ?
Beauty of recitation is not a requirement for salaat. Is it ? What if someone has speech disability ? His salaat will not be valid ? Also even many Arabs lack the beauty of recitation.
All the tradition of Abrahamic religions are not mandated for us to follow.
That makes a lot of sense. But as per Allah's promise Quran will always remain in its original form so anybody can always revert to Quran in Arabic and correct the mistakes made in translation. No ?
At least Muslims can pray together without any difference of race and language behind one imam. Now we have shia and sunni mosques but then we'll have Urdu, English, punjabi, bengali, tamil, kashmiri etc mosques. If you divide the Muslims like that there is 0% chances for unity.
Quranic verses usually rhyme together and that is an aspect of it's beauty. We are told to recite Quran with *tartil *(no matter how bad voice you have).
But we have their example and we can see that it didn't work for Christians and Jews.