I’d say it depends how deep you dive into it.
Potentiometers would presumably quite clearly show you how much travel your suspension’s using and that would make setup less about feel and guesswork.
Other data should be quite simple to analyse, such as when and how much brake you use, where you are coming off the brakes, where you are getting on the gas and how much throttle is being used, etc.
Personally, I think using data is very useful. I’d rely on data rather than feelings - it shows what’s really happening and you can use that to improve, rather than relying on what you feel is happening, which is very often not what is actually happening. Every day should be a school day and I’ll take facts over feelings any day.