Tasks and notes aren't the same thing. A note isn't always something to be acted upon. It might be the end product. It might be for future reference. A note can be non-actionable, or it can have many actions attached to it.

Sticky notes may be your way of limiting the number of tasks that are on your list at one time, but there are also many other ways of limiting the number of tasks "on deck" at any given time. You might do time blocking. You might filter by context, priority, and date. You might prioritize a certain project.

I have hundreds of tasks and thousands of notes at any one time. Having them all written on sticky notes would be ridiculous, overwhelming, and unproductive.. I have systems in place for keeping notes and tasks manageable.