Unfortunately it looks like folks building these things prefer to support 20th century tech. Can’t blame them as they would be limiting their market if folks needed to run new wires to their doorbell to use their products.
But I built my house in 2001, and still ran cat5e to the doorbell locations (which currently use a single twisted pair for Doorbell Fon units). I would love something that uses POE for power and communication… and have been waiting patiently, but looks like I’ll need to RasberryPi something together for this.
While it is certainly a bit more effort, there is a lot to be gained by not have these huge, surface mount monstrosities bolted to your wall, and the ability to use external cameras that can be located in better areas.