DLM is just a sticking plaster for a much bigger problem.... Copper networks were never originally designed for high speed digital telecoms. DLM is what it is! until we are all on full fibre optic.
Absolutely right, the original infrastructure (especially the aluminium cables), struggle to cope with high frequency products. Hence the absolute need for the 'plaster' (Dynamic Line Manager) to maintain stability.
I've said this a thousand times over, the vast majority of the public won't even notice banding, interleaving, retx, errors blah-de-blah ....... it's only on the geek forums that heavy scrutiny of a circuit takes place.
Yes, of course there are situations that are damned frustrating (especially intermittent cable faults and/or REIN), and as an engineer who has worked on both for well over 30yrs, I understand the frustration on both sides ..... OR and the EU's.
So, until the FTTP network is completed, the DLM will always be there working its magic.