Why does Converter no longer support OVA as a source?

I need to get a OVA file onto vSphere.  Using Converter would seem to be the most direct approach,

but it appears Converter Standalone 4.3 and later no longer supports OVA as a source.  

Any ideas as to why support for OVA as a source was dropped from Converter Standalone?

Aside, it is nice to see Converter 5.5 now supports Microsoft VHD.