As a group, yes. But as individuals and previously released team projects they have released a fleet of aircraft over the years. A lot of reasons you are unaware of went in to why the 737 was the decisive product, and it would likely surprise you, though this is not my stage to speak on for someone else. No one said it was impossible. That said, the reality is far more possible the 737NG will not be their first product. Just because the 737 may not be the entry product doesn't mean any other has to be considered "lite." I would find it very hard to believe PMDG does something so simple.