Another consideration which I don't think anyone has highlighted relates to the certification requirements .. ie what is demonstrated and investigated during the OEM development and regulatory certification process.
This has varied over the years. One should have an idea of what the particular aircraft was subject to ... if one goes outside this .. then one might get an unpleasant surprise at some stage.
For instance, one popular light twin was certificated on the basis of only approaching to the indications of stall .. a very experienced test pilot instructor related the tale of one of his students who persevered with holding an example of the Type/Model into the stall ... and promptly ended up in an inverted spin.
What the OEM writes up in the handling notes, POH, etc., is worth giving due weight .....