Reconnecting original tub during bathroom remodel

We will be renovating our bathroom soon and part of the process will be removing the original pedestal cast iron tub, which has all of the original plumbing still, in order to remove the LVP the previous owners installed, properly waterproof, and install tile.

One plumber who looked at the bathroom warned that it be an issue to reconnect it. So now I’m wondering if this is actually a real concern or if this plumber just doesn’t have enough experience with old bathrooms.

For those who did this, what was your experience?