CodeIgniter4 - Event listner

I am just wondering if that's better way than having all my code in one file and using series of if/else.

Hmmm, think there are distinction between events and queued jobs.

Events happen within single HTTP request, while queued jobs works with cron-like approach, but instead of having to figure out from specific record data that someone has passed a class, there's just record of that "event" in DB/Redis the you can have dedicated small bit of code generate PDF with, for example, after user has already received their response to their browser.