1. The article says that Primus comes from the Plane of Mechanus, but they didn't say where Mechanus is or much about it.
2. They mentioned that Primus may have once been a Primordial, but was unlike all other Primordials. ??? Then, to further confuse matters, Modrons are considered immortals (as in Astral Sea natives) so what connection does that have to the Primordials.
3. It didn't include stats for playing Modrons as a PC Race... which after reading this article I really want.
A picture of Primus would have been good too. I have no idea what this thing looks like.