I don't know, it's more important to some people than others. Sounds like your guy ticks all the boxes in the other departments, you're just struggling with this one aspect of his personality. So it's time to get real with yourself: how important is it to YOU? Everybody has those factors in a relationship that they deem necessary for it to be successful in their eyes. Is this a deal breaker for you? Or do you love every thing else about him so much that you can look past it?
For me, a sense of humour is a must. One of the reasons I married my man is honestly because he makes me laugh every day, and being a high anxiety person I really, really value this. So I have my reasons, but they may not be the same for you.
Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi