Maybe you misunderstood me -- I don't think it's a bad thing. I think there are people who will think it's a bad thing and my comment is just stating what I've seen on the inside -- I've never once heard anyone talk about trying to lock out owners from doing their own repairs. Most of these people are owners themselves and their neighbors are owners, etc. From what I've seen, the firewall is to protect the car and its owner, not to prevent them from doing their own repairs (that is only a side effect from making the car more secure).