Matthias Noback explains the value of singleton objects: when used properly they can make your code more developer friendly.

I'm not advocating the use of façades and helper functions per se. I assume they may have good use in specific parts of your application (just as the Laravel documentation states, by the way). My point is that, as long as you build into your libraries both options, you can offer a great developer experience, providing an out-of-the-box working solution of a useful service, which can still be used in a project that uses dependency injection everywhere.

https://php-and-symfony.matthiasnoback.nl/2017/05/the-case-for-singleton-objects-facades-and-helper-functions/