@Philip A €100 watch can display many metrics, but that doesn’t mean the data quality is comparable. More numbers do not necessarily mean better measurement.
We don’t know exactly which computational models Suunto uses on the Vertical 1.
Sleep and HRV algorithms are strongly tied to the hardware, especially to the OHR sensor and signal quality.
The Vertical 2 uses different hardware and a different optical heart rate sensor.
It is plausible that any algorithmic evolutions are designed around the newer sensor and are not backward compatible with the Vertical 1.
For this reason, realistically, it is difficult to expect major new implementations on the V1. Future developments are more likely to focus on the newer hardware platform.
The price of the device is not the decisive factor. The hardware architecture is.
EDIT: From the photos, the Suunto Ocean sensor appears to be the same as the one in the Vertical 1, and the Ocean does report deep, REM, and light sleep stages. So, in theory, the Vertical could inherit those features.
That said, I may be oversimplifying. Even if the hardware looks similar, firmware architecture, signal processing, and model calibration can differ significantly between devices.