This is correct. Water has an extremely high heat capacity, meaning that it takes a lot of energy to warm or cool it by any noticable amount. Land does not. So while the different amount of sunlight in summer/winter changes the land temperature by a large amount, the ocean barely changes. Most of the land on Earth is in the northern hemisphere and therefore we get those temperature swings.
Remove the risk of losing the ability to cast Wish.
Remove the limitation on what you can do with the second action from Haste.
A lot of spells only have one sentence about resisting or avoiding the effect. Like remove the save from Polymorph on an unwilling target, or remove the ability to discern most illusion spells.