Dynamic Array formula not backward compatible

Unless I am getting myself confused, it is backward compatibility that is enabled by the SINGLE that inserts implicit intersection into the process, as was always the case for the traditional Excel calculation.  Forward compatibility in which old versions are expected to emulate dynamic arrays will be more of an issue.

Mind you, I seem to be the only person on the planet who consistently used named formulae to bypass the Excel's implicit intersection trick and allow me to perform many array calculations without CSE.  They work equally well as traditional or new dynamic arrays.