Right to left left to right not too big of a deal. The greeks wrote
side to side to side
The reason why they use the classical naskh style writing is because they always done so. Same reason why some words in quran have small alif rather than full alif e.g. Ψ§ΩΨΉΩΩΩ°ΩΩΩ
ΩΩΩ instead of Ψ§ΩΨΉΩΨ§ΩΩΩ
ΩΩΩ Its a bit more complicated than that but thats basic
In my opinion modern kufic aka sans serif for arabic is more legible when done right however the harakaat are awful and i hate trying to read the small lines that are used. Also a lot of these fonts use rectangular edge to the letters but circular dots rather than square and it doesn't sit right with me. The fully square doesn't feel right, maybe they should use rounded square
And a lot of the time they mess the font up and make it illegible in the pursuit of minimalism. The letters have no difference hard to tell the difference between ΩΩΩ and ΩΨΊΩ or ΩΨ― and ΩΨ±
Square kufic can also refer to
this calligraphy style and i hate it so much you cant read it. Even if you know what it says and you can decipher other caligraphic styles this one is just horrible. Arabic was not made for carving