It doesn't say that it'll just be a "water raft"...it may also travel over lava.
I would be surprised if there are rafts that travel over land and and others that fly. If there's floating islands there will obviously be ways to get to them.
Land rafts would probably have missile launchers and turret bays...to break all established lore and confuse the newbies as to what genre this game is.
As I mentioned before, I am a fan of these abilities that promote exploration that probably wouldn't otherwise be possible. But I'm really curious as to what the "X duration" is on this raft. If it just disappears while your whole party is on it in the middle of the ocean, that could lead to some very... interesting scenarios ;)
the raft summon is awsome i can just imagine myself rafting down a snowy mountain with an avalance behind my back lol,( back to reality) if rafts is a thing would something like summon cart be possible too to have a bigger inventory space for those long dungeon runs everybody loves? also could that summon cart funtion as a sales stall in cities when you wanna sell your stuff? so much possibilities with the summoner class can't wait to be able to see the whole spell arsenal.
I see this raft being not very good in oceans. But streams or even lava or other small barriers that you “could” cross but choose not to. And old school nes LOZ is A+ in my opinion.