IED does not imply professional or military design
Quite! I explicitly referenced the use of military munitions to make up an improvised explosive device, rather than the far less powerful device that can be made from legally purchased items at a hardware store.
UK politicians and police rarely refer to home made bombs as an IED, neither should their Australia counterparts.
In my view "IED" is a more terrifying term, "home made bomb" more accurately describes the threat and so educates the public.