There have been many discussions on nut size and string spacing - with many different views, though too narrow or too wide a string spacing can pose difficulties.
There are two related aspects - the total width of the nut and the string spacing E-E
Out of interest these are the figures for various "historic" instruments, with one more recent guitar added. All apart from the last two are taken from Bert Eendebak's data on designofaclassicalguitar.com. The last (the Hermanos Conde 1968) is a guitar I own and although it has a wide nut and wide string spacing I find it very comfortable to play, at the very least as comfortable as other guitars I have with standard 52mm/43mm spacing - but there are other factors at play (apart from string spacing at the nut) in what makes a guitar comfortable to play.
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Guitar Nut Width String Spacing E-E
Antonio de Torres, 1864 49 42.5
Santos Hernández,1933 50 41
Hermann Hauser, 1931 52.5 43.5
Hernandéz Y Aguado,1963 52.5 45
Ignacio Fleta, 1968 52.5 43.5
Robert Bouchet, 1963 50.5 44
Daniel Friedrich, 1992 51.5 42.5
José Romanillos, 1973 52.5 43.5
Ana Espinosa 2014 52 43 (owned by me)
Hermanos Conde 1968 53 45 (owned by me)