The main issue with copper comes from the active infrastructure rather than the physical lines.

I work at an ISP that gets DSLAM equipment from Huawei, we run one of the few G.fast VDSL deployments in the world using this particular hardware. Huawei has stopped manufacturing this product line (the Swiss market is a rounding error ;), which will force us to fully migrate some neighborhoods, only for backup inventory.

Germany being 15 years late, I assume you can still buy similar hardware from AVM though.