Hi Ken, I will defer any further from the classification debate. It is subjective, I can see both point of views, and being so far from the buildings!! etc.
Angle ties ( with no dragon ties) between level assembly buildings may be seen at
The saw pit shed, from Sheffield Park, nr Chailey, re-erected Weald and Downland Open Air Museum.Circa 1820
I have also worked on a Hay Barn from 1805 in Cuckfield with "normal assembly" that has angle ties between the tie beam and plate. However a Hay Barn from Ockley, Surrey, also re-erected at the WDOAM from 1804/5 does not have angle ties with its level eaves.
These angle ties are lapped not morticed and tenoned. So getting back on thread, then angle ties are found in early nineteenth century frames on both sides of the Atlantic. The Sussex and Surrey ones are lapped with dovetails, whilst the NH examples appear mortice and tenoned. Regards Joe