Strava is really good at keeping data. That's one reason I thought they could limit how much they keep for free members to boost premium membership. Since I do pretty much the same few routes all the time, I used to write down my information from the bike computer/HRM and transfer it into a spreadsheet later. Strava does all that automatically and I can get it in whatever form I want. It would be another good premium feature to be able to download info in spreadsheet form so I can sort and make my own charts - Strava charts are not very useful - you can kind of copy and paste Strava data into Excel but it's real clunky.

And it's pretty easy to not use the features you don't want - I've never used the route planner, I only compare my times to people I'm following, etc.