The only difference is that we haven't seen a real user of Snake Sage mode...besides...Mitsuki I guess?Makes sense to me.
Also I feel that Toad summons are by far the most OP summon in all of Naruto. It's almost silly how much better they are compared to even snakes, much less the other creature summons that exist.
Snake Sage mode immediately kills you if your body isn't strong enough to handle it, and considering Orochimaru's body isn't strong enough to handle it then that really raises the bar on who's strong enough to get a perfect snake sage mode. Kabuto only managed to get it after grafting DNA into himself, he's probably not a perfect snake sage. Maybe Mitsuki is a perfect snake sage? who knows? wait a bit for Boruto to flesh out some things.
Besides, the ability to wield the surroundings as a weapon > the ability to extend your punches a bit, in my book. Though Frog Kumite just works better for Hyūga's so it'd go with them anyway lol.