Mismatched signals

HOW RIDICULOUS IS THIS?

The newly opened Elizabeth Line is supposed to link east and west London. However if you wish to travel from a station east of Paddington to one west of it (or vice-versa), you have to change trains at Paddington. This is far from simple. The section of the line that runs west from Paddington is on one side of Paddington mainline station, and the section that runs east is far across the mainline station concourse at a lower level.

Platform lighting at Paddington Station (Elizabeth Line)

Today, I asked an official whether the east and west branches of the Elizabeth line will ever be connected, so as not to need to change trains at Paddington. He said that the infrastructure (tracks etc) are already in place, but there is a problem that still needs to be solved. The problem is that the signalling system on the western part of the line is completely different from that on the eastern part. Surely, someone could have solved this problem during the many years it has taken to construct the Elizabeth Line(s)?