This is a question about numeracy, not "flawless rollouts." It certainly isn't a question about Brexit.

Bias in media reporting is a factor here. That bias is driven in part by feelings about Brexit and about a system that exists in this form because of it.

Either way, the fact that it has been used ten million times successfully strongly suggests it is basically doing OK, since it's hard to imagine many more than ten million uses since the alternatives became unavailable.

Glad to have your obviously authoritative review of the subject, though. I am suitably chastened for trying to show the broader picture.