Ciro Santilli @cirosantilli 35

youtu.be/oCelMyMtRCk?t=167 mentions that they get their lipid layer from the Golgi complex of the host, where they replicate.

Integrates its RNA genome into the host genome.

Sounds complicated! The advantage is likely as in HIV: once inside the cell, it can remain hidden far away from the cell surface, but still infections.