This is often done as a temporary measure. It will not “compromise” your neighbours connection. VM would not have installed it without checking out the signal levels. In any case all the cables are effectively joined together at the street box. The reason for the delay should be explained by VM, but often it’s a blocked cable duct and they need to get permission from the local council to dig up pavement/highway. Local councils seem to move at a slow pace, to put it mildly.
Tudor There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2