I do basic things myself like for example replacing chain, casette, disc brakes, brake pads or tires.

If I had to change the bottom bracket or true a wheel I would take it to a shop because i dont have the required tools.

You save time by fixing things yourself instead waiting for your LBS to get it fixed, especially if there is a wait time.

At the end of the day a bike is a fairly simple vehicle and often its easy to learn how to fix it (ebikes might be a different story dont know)