> How many people do you know who want to change their own oil in their car? This is a frequent, required maintenance. Yet I can't think of a single car that advertises its ability to be maintained by somebody without special tools.

Those are two very different topics. Sure, cars don't advertise their ability to be maintained without special tools. But I also know a lot of people who do in fact want to change the oil in their own car (because it's not hard, and much cheaper once you have the tools).