You need to see more people in your day to day life, then. I saw a lady on the subway that had a rectangular smart phone that folded in half to be a little square to stow in her purse.

Also, one of my friends has a fold out phablet for gaming.

The fact that I noticed and remembered both instances shows that phone makers have been doing a good job of inventing interesting and innovative hardware. The fact that there are only two instances for me to remember speaks to the fact that they have not been as successful at actually getting people to buy them.