Why would I want one? My ten year old Garmin 500 still works perfectly well. No mapping features on a bicycle GPS interest me at all. I know where I'm going. Even when I don't know exactly where I am, I still can get to the destination.

All I want is a unit that will record information from the various sensors on my bike and my body, along with it's GPS track log information about where I was. I like to review my data after the ride, so data collection will always be the main function I want.

Things that might make me buy another.... Control of lighting, control and display of radar information IE Garmin Varia, Live Di2 information while riding and being able to change some Di2 settings during the ride. Allow me to read text messages and alert me to phone calls. (many times I miss the ring with the phone in my jersey pocket). Control and setup of cameras. Maybe at some point control a drone following me.

Essentially I want a device on my bars that will handle all that stuff and more. Either by software it comes with from the factory, via software upgrades or allow me to add apps. Sort of like a smartphone. But not my smartphone. I still believe I should keep my phone on me and as protected as is reasonable just in case I need it for an emergency.

Anything navigation or map wise is fine if it does, but not what I'm going to be looking for at all.