For those who use training scenarios after V1; would these result from a single systems failure in your aircraft.
Are these realistic 'aircraft unable to fly' situations, or just 'lets think of a situation'.
There is no training value in the latter, which could negatively influence crew's interpretation of real, but not critical failures requiring continued takeoff.
I doubt that any modern aircraft have any single, undetectable systems failure which results in the inability to fly.