Telstra wanted to sell my mother in law a new phone when she was connected to FTTN. The NBN modem was connected to the same point as the old cream T-xyz phone she had. A new cable and the old phone works fine, when the NBN is also working. The presets which she knows by memory and buttons which are large caused zero stress with her degenerating eye sight.
FTTB used for many units is the same scenario.
HFC which we have in our town house is a little different, however the installer indicated he could run the internal cable within reason to a more suitable point than where the coax had been terminated externally. That included being able to use the internal extension phone line once it had been disconnected from the copper line service physically.
With HFC we found our ancient cream T-xyz phone worked fine once plugged into the RSP supplied router.
We have had several older Panasonic cordless phone sets. All with small handsets. We use a giant sized Uniden in preference as the minature displays and keys of the Panasonic’s are beyond us. If we looked at another of this make, size is everything. Hopefully they are as reliable as the Uniden. Our reliability experience with Panasonic is mixed.