There we go, when the chips are down, The contracting card is played. This debate is not about that contract we entered into, BUT the principals that should drive HOW those contracts are formulated in the first place!
And if you can't see that a network is a network is a network, then you are completely blinded by your long exposure to whatever network you are working in. The cost of provision of each network type is different and yes, that might influence the final service charges, but in essence, there is only one line in a business plan to cover that.
There is a line to cover "maintenance", and another to cover "replacement". The rest is just detail.
A "network" is built, with a coverage/extent/reach, with a certain capacity to handle service provision, within the constraints of the technology deployed. That is all, nothing more, nothing less.