Re: No great surprise here
If you are asking why don't we just have a Ethernet port on the wall to plug into?
This would be down to the technologies being deployed.
The FTTP NTU had the option of running 4 ISP services, and 2 PSTN to VoIP services.
The FTTN needs a VDSL modem, which only allows for a single ISP and a single PSTN to VoIP service.
In Japan they must have a NTU with multiple ethernet ports servicing appartments. Technically we could have this is the FTTB model but the apartment buildings will need to replace their crappy phone lines for CAT5 ethernet cable.