I honestly think the next thing to do would build a decent app to replace a bike GPS... there is nothing special about a head unit other than the ANT+ radio (which is superior to BLE in a lot of ways). The only one that comes close is shimano's e-tube ride, but they abandoned the app before adding critical features like GPX import. Everything else I can find is bloatware or is just really awkward to use.
Quality bike computers are specifically designed to fill a niche that smartphones just can't do, which is why the market still exists.
Strava, et al, work fine for a lot of uses, but as one gets into more serious riding a dedicated bike computer is the way to go. This is because of the hardware, not due to a lack of app to be run on a general purpose mobile.
Plus, it keeps my phone free for photography.
I’ve used it for a few years, and battery life is excellent compared to all the other tracking apps I tried.
That being said, the head unit is not as sexy hardware. The UI looks dated, the screen tech isn't OLED, and the battery life is "just ok" given the age of the other tech.
The final thing is I actually trust Garmin not to "sell my data", unlike google/apple.
I guess consider jumping ship if I had the Connect ecosystem, just done a little better!