The system expands the wireless powers of a Nest mesh system and adds Thread and Matter support, but it can't work with older Nest Wifi hardware.

Google says that Nest Wifi Pro's router unit ($199) can cover up to 2,200 square feet per piece, which is 200 questionable feet more than the Eero Pro 6E and has a theoretical top speed of 5.4Gbps.

If you owned that decent-coverage Nest Wifi and wanted to use its access points with a single new Nest Wifi Pro router, you're out of luck.

The Nest Wifi Pro is not backward compatible with either Nest Wifi or the Google Wifi that preceded it.

You're also losing a feature from Nest Wifi: Google Assistant microphones and music speakers built into each unit.

There is something new in the Nest Wifi Pro besides 6E, however: Thread and Matter support.

Each Wifi Pro unit can act as a Thread border router, creating and expanding a mesh network of connectivity for low-power devices around your home.