There is still a list of supported wired flow sensors for the G2.
The G2 does not support wireless flow sensor like the G3. That is a hardware limitation.
Wireless flow wasn’t a show stopper for you when you bought the G2.
Do you not expect them to evolve the hardware with each generation?
There is no functionality lost on G2 from the day you bought it to now. If wireless flow is that important to you, upgrade. It wasn’t that important when you purchased G2 as you bought the G2 without it. It should continue to work as it has.
I too wish my G2 worked with the Rachio flow sensor, although I wished it was wired, not wireless. I’m not disappointed, I’m happy that Rachio is evolving. There may come a point that there is a compelling feature for me to upgrade for. Maybe G4 (or even G3 at some point) will support wireless soil sensors and have a physical network interface. I hope they keep evolving and adding features and functionality.
I’m sure with the new Flow Sensor, flow data implementation will improve and G2 will benefit from this as well.