When the iPhone first launched in 2007, Google didn't even think of making Android for touchscreen phones. Of course that's all changed right now.
A Google report from court documents forming up the current Apple vs Samsung legal debacle explains that Android "was designed with the presence of discrete physical buttons as an assumption. However, there is nothing fundamental in the product's architecture that prevents the support of touchscreen in the future."
[
Scribd via
Recode]