I'm also an adult using Brili and this is one of my primary issues. Building a new routine is super cumbersome, even if doing so by duplicating an old routine. The two reasons why are
1) having to click on each individual task to enter its settings to delete a task
2) not being able to create a "library" of custom tasks
I wish we could swipe left to delete a task, like most other apps on iPhones, and I wish we could create frequently used custom tasks in the library.