...except when they do. If you get a leak or an air bubble for example and have to flush the system, you'll need a trip to the bike shop.

If you put miles on your bike and ride hills, you'll spend way more time fiddling with an allen/torx on the inboard pad or the adjustment barrel on the cable as your pads wear. The bleeding procedure for hydraulics is for sure messier, but still very doable in 5 minutes. When you do have air in the system, pumping the lever a bit gives you back some braking function.