Hung, that's exactly my point. There's no hard dividing line between aerobatic and non-aerobatic aircraft. Every aircraft has its limitations (listed in the POH) and some aircraft allow more and more aggressive aerobatic manoeuvres to be flown with them than others.
If you're just getting into aerobatics, like PPL152 is, then it should not be that hard to find an aircraft that allows simple, basic aerobatics (as described in the POH). Once you go into competitions, displays, Red Bull air races, whatever, you are going to need something specifically designed for the purpose. An Extra 300 or something.
And even an Extra 300 has limits that need to be observed. Although in most cases, your body will hit its personal limits before the Extra 300 hits its.