I have to say, I don't know anybody who has a full understanding of DLM logic. Not even our resident brain-boxes have the complete picture on that one, but I take your point about 'awareness'. The only addendum I would add to that, is if the engineer has comprehensively ensured that the MPF is as good as it can be, then DLM activity is nothing to do with us ..... see: RFI, REIN, EMI etc etc .
I personally do not think self-install is a good idea, and won't be as big as some think. I probably get one a fortnight whereby the EU has 'No synch'. They have usually moved into a new premises and inadvertently plugged a micro-filter into an integrated filter. This should of course, be resolved via the 'Fault reception' front desk, but it isn't. I shan't mention which ISP tends to be the guiltiest regarding this, suffice to say they are the ones that are pushing the self-install product more than any other.
The same example would probably follow during a VDSL install with some EU's ??
Lets be reasonable here though, these ISP's aren't in business for nothing. They will (as they always do) be working on 'percentages' as a business model, in as much as
most EU's will manage a self-install if they choose to, thus enjoying a cheaper 'Customer experience'
. The rest will need help to maximise their installation, and will have to pay for it.
Cheers Walter.