I'm actually of the opinion, that blue-green colors like teal or turquoise are both green and blue at the same time. Basically a mixture.

Having to pick just exclusively one - blue OR green - for such colors just feels, wrong and arbitrary?

You could also make a website that shows various shades of purple - and ask people is it blue or red? Well, both! Purple is a mixture of both blue and red. Why treat teal differently than purple?