On your other question congestion is unlikely on FTTP. In fact it's unlikely in new build areas at all due to take up and how they are built.
While it may start out using the same technology as the HFC areas, just all fibre with no coax, VM can selectively move to an XGPON solution at their convenience. Heavy customers can be migrated to it to relieve the DOCSIS / RFoG network, followed by everyone else progressively.
I understand that at some point in the future the FTTP and HFC areas will diverge slightly as far as what is available goes. Not all VM areas are created equally and holding back some until others can keep up doesn't make commercial sense.