You can use an old style computer: speed, time, distance. No internet, nothing else. The ones with 7 segment LCD digits. They are cheap, battery lasts years and you still get the information that matters most.
For me the information that matters most is subjective: how do I feel? What is my output? Do I feel that my pedal rotation is too fast or too slow? Do I feel fast? The one exception is when there's a strong headwind, for some reason I find a velocity display to be very motivational. Distance is useful sometimes. But everything else is distraction.
Its bewildering all the consumer products that go on to track things like watts, etc. I played competitive sports in school and we never bothered with anything like that even if it was available. You run until you are exhausted then you run some more. Same thing with a bike ride if you are trying to put work in imo. Want to train for hills? forget the Peloton, just go and ride up some hills until your legs are cooked, and next week you will be able to ride longer.
Yeah for me power & heart rate are far more important than any of those metrics. Once I started paying attention to those two metrics my biking ability increased significantly.
