Earlier quoted context omitted.
I don't think the parent is trying to justify the overall ridiculousness of the process, merely explaining what their rationale would be for even going down the IE-only path in the first place. I'm not sure if anyone can justify the need for ActiveX in this case.
The assumption that ATT needs to do it, is like assuming that a website needs to use cookies - it doesn't follow the money. The article implies that this process costs ATT millions, whereas logic would make the continued existence of such a practice unlikely and analysis of ATT's cost and revenue structure would indicate that it probably has the opposite effect on their bottom line. ATT's homepage for DSL customers i…
Well, that's one way of interpreting it. Another way is to say that AT&T is a monopoly provider and therefore has no incentive to cut costs. The fact that the setup process is baroque doesn't cost AT&T anything - its not like customers have a plethora of alternatives for their broadband access. So, what AT&T optimizes for is cost of development, and I can assure you it was cheaper to develop this "solution" using half-trained consultants than it would have been to develop a well-designed setup page using experienced software engineers.