But in the world of software I don't think it can be called highly complex. The issues that I find I need support with are related to implementation, networking, and office flow, and tech support can't help with that.
I agree that the software itself isn't complex as far as the user interface. But its interaction with the hardware you own, your network, your staff, other programs like the PM you use, Updox or PaperPort, the lab interfaces, all make it (for me) beyond what I've ever encountered in an off the shelf application like Office.
I've had a few situations that tech support has helped me, even with hardware & network issues. But I agree, most of the value of AC's support charge is probably the need to get AC updates keep up with government requirements.