The Symfony coding strandard documentation states:

Add PHPDoc blocks for all classes, methods, and functions (though you may be asked to remove PHPDoc that do not add value);

For example the inherited methods should not contain any PHPDoc comments, except if we want to add additional details.

use section does not actually need \ at the beginning of the classpath (leading backslash).
Let’s enforce it by static tests to prevent appearing such cases in future

Originally posted by @ihor-sviziev in magento/magento2#26129 (comment)