Arrays' UI is a list of files of infinite horizontal arrays of text editors & wherein the leftmost editor is pinned. & which allows you to write & browse notes to the side while writing your draft in the pinned editor. & which makes it more powerful than Microsoft Word & Google Docs & Obsidian & RoamResearch combined because it balances drafting & notetaking & iteration. The former 2 can only draft. The latter 2 lack balance.
Matrix' UI is a infinite matrix of text editors. It can be used to write essays on a paragraph basis (& to take notes on the side & in the same row).