Redbadge
Explorer
I'm not going to list every immediate interrupt. The Compendium is easy enough to browse through.
As I said a couple of times. If your group has no problems with it, then it isn't really a problem. Keep on truckin'. My group(s), however, would demolish the physics of time and space in its abuse![]()
Just had to laugh out loud at my first reaction, which was basically: "WHAT?! He thinks his group is better/smarter/more resourceful than mine? Outrage!"
Pretty nonsensical reaction on the whole, but it just came to me unbidden.

No doubt my group has tried to break our "non-rule" because some of them are about on the level of lordduskblade and others on the CharOp forums, if you're familiar with them. They just got bored long before they found the broken interactions, which you and I both agree are most assuredly there somewhere.
I think you might find your group would find it too much work to break on-turn immediate actions, with little gain other than to "demolish the physics of time and space." Of course, you don't seem to have a problem with the rule in the first place, so no need for you to go experimenting.