Not sure where you got the disagreement from because when I talked to him he seemed open to having oceans as large as the ones Minecraft originally had (30,000 M), if at least in a loose functional manner. He was open to it, more so because of boats & animals, or maybe that's just being formally polite.
But I do agree the way oceans are now makes them feel like lakes, not oceans. If I have to make a canal then it's not an ocean.
Hmm... I honestly do not remember if this was something I read on the forum or something I remember from a chat with him. Oh well, if he wants to make them larger (and more irregular in shape) than present then that's great! Considering that we are still waiting on swamps and volcanic biomes, I predict more terrain changes in the future