Re return on investments...
Maybe they could've thought about a network that intelligently was ready for full unbundling? In Italy there's two networks and they can do full PON unbundling with compact and small street cabinets housing splitters, so everyone could use the passive network as they want (GPON/XGSPON/10GEPON/whatever you want), invest together in fewer cables around the country and lowering costs for everyone. But of course, why thinking about it before... Meanwhile, I don't complain surely about my FTTP, but having these poles outside with 6 CBTs on them and wires around like it's 1910.