Blame it on Gregor Mendel!

Hybrid is a very useful word. Don't let it's use as a marketing term change that.

slorollin, Your bike is not a mish-mash, it is "customized".

Bicycles had been relegated to sport in America, neglecting their ability to be used for transportation. A bike like yours in another country might be just a bike, but in USA, where mountain bikes and road bikes have dominated the market, bikes like yours have only recently come into wider use. If you want to categorize it, I'd call it a hybrid or maybe a utility bike. If you don't want to categorize it, just call it a bike.