I think there should be a warning for those new to the mod (mostly content makers) when they pull a Formidibomb or command block book out of creative too early. Even if the symbiont is spawned in any stage besides the ones it should.
This could be disabled for testing but I think it might be useful

Yes, this should definitely be a thing. Maybe it could be in the form of lore text on the item or in chat after it checks for the correct conditions

I’d rather not send intruding chat messages but instead prevent this via gameplay, as in preventing the Wither Storm from being F-Bombed at phase 4.

What about a tooltip like "Not ready" in red