On DM-6631, Russell Owen asserts:

Command-line tasks are encouraged to be in the package that makes most sense for them, so IsrTask belongs in ip_isr. pipe_tasks is intended for tasks (command-line and otherwise) that need so many packages that they don't make sense being in a lower-level package.

I certainly don't disagree – seems perfectly reasonable – but I've not seen it written down before. Please capture this in the developer documentation.