I do think ignition is been a bit harsh/cold in his opinion. Even black sheep see's a benefit in rolling this technology out.
The problem is how BT are looking at the value of the technology. Sadly they seem to be adopting VM's method of thinking now.
In terms of value in the following areas, the benefits of vectoring are huge, this is further amplified by the fact that g.fast will not be available to many in the forseeable future meaning vdsl2, is the best BT will be offering.
Customer Satisfaction
Line stability
Fault Reports - yes many faults are complaints about loss speed due to crosstalk. also that even if a disturber doesnt affect line speed, they can affect error rate which in turn can trigger DLM.
Speed of line, even the modest gains from openreach data (which are low compared to trials) of 10-16% is enough for user's to be grateful.
My line as an example, when I first got this pair I had circa 0-3 ES a day on my US and about 120-150 a day on the DS. Even tho my US speed hasnt really dropped the error rate is now about 30-80 a day and the DS about 150-300 a day (with the DS losing about 2mbit of sync speed in the time period).
Also the cost of the cards in the grand scheme of things is actually small for a company with BT's turnover. The problems is their accountants obsess over "every" cost whether small or big, and have probably very coldly only looked at what marketing gain vectoring brings, which sadly is none. Its all about marketing these days, not customer satisfaction or reduced level of faults. I suspect if openreach wasnt behind a shield of CPs (dealing direct with consumers) things may be a different story. To put into perspective, vectoring cards will definitely be cheaper than deploying g.fast cards and benefit almost everyone, but the latter offers something new to market hence been approved.