Most people don't use strava as the main data aggregator, only as a social platform. Most use Garmin or Polar or similar, and then sync a copy to Strava.
And I really disagree. Maybe one doesn't need a good cycle computer, but the stats and motivation that brings is invaluable. Seeing the actual data instead of just an average/total at the end is very useful.
There's also a number of things you can do with an old Android smartphone and some common apps that create GPX format track files, if you want to import your ride paths into Google Earth pro on a desktop PC, without uploading to a cloud based service.
You don't need some $400 bike computer and a cloud based service to achieve a high level of road cycling fitness. Have a good digital scale at home. Track your cumulative riding distances and average speeds. Eat healthy, etc.
Having an offline log and metrics to compare your own performance against is extremely useful. Data and information can be a powerful motivator to compete against yourself to improve your average speeds, climbing times and so forth. Where I disagree philosophically is whether that data needs to become a subscription you pay forever for, or if your data needs to ever go out to a third party.