Calls handoff between T-Mobile 5G and my wifi mesh network is seamless and nothing but impressive with P6pro. Even my ZF3 has voice interruption sometimes.
It's definitely much nicer to come home to. With my 2XL, I'd pull into my garage and then have to deal with my phone being unresponsive as it connected to my wifi. This phone I don't even notice it connecting and disconnecting.
I have the same seamless experience with my Pixel 6 Pro.
When arriving home, the transfer from cell tower to WiFi is smooth and unnoticeable.
My provider is Google Fi.
My router is a NetGear Mesh.