Put it this way: If you've spent all your life tasting the same color of ice cream, wouldn't you one day opt for a different color if offered it? And do you think you wouldn't prefer that new color to the former?
I understand your concept and agree that if one is offered the opportunity to try something new that they most likely would opt to do so. However, I think to assume that one will automatically prefer the new option simply because it is new, is incorrect.
Using your example, I always preferred French vanilla ice cream as a c h i l d, not the plain vanilla, but the slightly yellow, rich, creamy French style made with real vanilla beans. One day someone gave me strawberry ice cream, which looked very pretty- a nice pink, sort of like the color of the inside of a cunt. I thought for sure it would be delicious. I didn't like it. While it looked pretty, it tasted terrible. So, even though it was a new choice and looked pretty, I preferred my good old standby, French vanilla.
Eventually, I did find other flavors that I enjoy as much or more than French vanilla: coffee flavored ice cream, raspberry swirl and mocha almond fudge.
So, while your point about trying new things is valid, at least for those unafraid of change, one may need to try many new things before finding the something or things that they might enjoy more than that with which they started.
But isn't that what life is about? The adventure of tasting a little of everything to see what is to be enjoyed?