Issuing 78s is a bit of a gimmick really -- they're pressed on vinyl not shellac and while there might theoretically be an advantage to the faster speed (a la 45rpm issues) most motors running at 78rpm are noisy as heck so that kind of defeats the purpose!
They're fun nevertheless if you have 78 in your player, and you don't need a dedicated stylus -- Jack White is a big proponent
https://www.billboard.com/articles/news/6538682/jack-white-third-man-records-first-elvis-presley-rec...
Of course mono is a much bigger and realer thing -- the market for mono only carts and expensive reissues of rare mono discs -- like this which is one of my faves
https://www.discogs.com/Johanna-Martzy-Radio-Recordings/release/9966202
They're fun nevertheless if you have 78 in your player, and you don't need a dedicated stylus -- Jack White is a big proponent
https://www.billboard.com/articles/news/6538682/jack-white-third-man-records-first-elvis-presley-rec...
Of course mono is a much bigger and realer thing -- the market for mono only carts and expensive reissues of rare mono discs -- like this which is one of my faves
https://www.discogs.com/Johanna-Martzy-Radio-Recordings/release/9966202