In Talbot's time most good writing paper sized with gelatin. It is ridiculous to attempt a salt print w/o gelatin.
But of course we are not in Talbot's time; this is 2017, and all sorts of things are available to us that were not available to him.
There's no need to be hidebound by some spurious notion of "historical accuracy" when making prints, unless that is one's sole aim.
If the point is to make a beautiful modern print, then we are quite free to use all the materials available to us, and what Talbot did is not important, save to the extent that we acknowledge and honour him.
If one wants to size one's paper with starch, albumin, or even a "dry size" such as fumed/colloidal silica (e.g. Aerosil) - or indeed to not size one's paper at all - we are perfectly at liberty to do so, and it is certainly not "ridiculous" in any way to not use gelatin.