I notice some "other" rotation helpers suggest additional interrupts. I mostly notice this on my rogue. Hekili only ever seems to suggest kick, but Kidney Shot is a viable interrupt too, and actually works many times when kick won't. I suspect the same may be true for the Tauren War Stomp and other stun spells that can effectively interrupt spell casting. Have only tested this for sure on the rogue, though. I did try adding Kidney Shot as an interrupt in the interface, to no avail. Might have done it wrong, I suppose.

All this being said, I love how much more lightweight Hekili is, and personally would not want to overtax the add-on. I felt like the other rotation helper I was using was too bloated.

Hi; there's no real reliable way to tell when a stun is going to work (or not), and if it will successfully interrupt vs. many creatures. As such, it's potentially a DPS loss to tell people to spend time/resources on a stun that may not work.

There's no API available that tells if a target is stunnable. If I had to guess, other addons just recommend stuns as a fallback option in general. That's perfectly fine and achievable through a custom priority in the addon.

I may develop a feature to help make it easier to add/remove utility stuff (like interrupts, dispels) to the priority without getting into the challenging part of developing a priority.