This is a valid point but it highly depends on the use case and larger context on whether this will be relevant or not. If you have a table where you fetch multiple rows close to each other in paginated manner this would be relevant for the performance but if you only fetch individual records by uuid, data locality wouldn’t increase the performance.
It just felt like there is at least one HN submissions each week about a new text editor written in X on the front page. Seems like writing a new text editor in a new language is the new Hello World!