Classes with a lot of lines of code are generally bad. Too many responsibilities, low cohesion, or both. However, sometimes it is not possible to make functions smaller. Reasons could be various. What can be done in this circumstance?

My system is safe, it uses encryption. You heard/said this from time to time. Sure, but why and how is it safe? Do you really know this?

More than once I needed to render a laravel view as a downlodable file. This task could be easily accomplished

PHP 8.1 introduced the new Fiber class (see the proposed RFC here https://wiki.php.net/rfc/fiber), which allows running coroutines inside your script, i.e. two functions executing simultaneously