I live at about the maximum ADSL range from my central office and for years suffered with service that was slow and unreliable no matter what.
They put a fiber node just out of VDSL range but I have ADSL with two lines at 18 Mbps/s with an application-level load balancer. Each of those lines performs as rated almost all the time.
In the early 0's Frontier struggled with "middle mile" capacity even for customers who only got 1 Mbps DSL. People would have their service turned off with no explanation in my neighborhood, I had gone all the way up the CEO of the company to get help with one of my lines, the truck was followed by some lady in a car who was desperate to get hers fixed. Even when it worked the 1 Mbps DSL like would give more like 30k.
Eventually they fixed it, but around that time they announced they would implement a miniscule 10 GB monthly data cap which they were forced to suspend indefinitely once the public heard about it.
(I understand that upgrading DSL is a challenge, but there is no excuse for not upgrading the middle mile.)