Well my dad is primarily melancholic and he's always been a workaholic simply because that's how he was raised. My mum on the other hand is choleric and she's not as industrious as my father (she's a stay at home mom, so that makes sense lol). So a person's temperament doesn't predetermine their particular set of faults and virtues because everyone is different and isn't going to fit that classification 100% because we all have had different life experiences etc. .
I don't think being a workaholic should be a bad thing. I mean think about it. It shows the man is dedicated and focused on providing for his family day in and day out, even though he doesn't know how to say "I love you" or be the romantic type you expect your husband to be. Compare that to someone who knows how to romance you, but doesn't love you enough to at least go out and kill something and bring it home.
I can't say what motivates your father, but I'm just speaking in general.
Actually, now that I think about it... some of my gal friends have complained to me about some similar issues with their boyfriends. They're so focused on trying to make provisions for them that they forget about their emotional needs. And these guys are not cholerics. I think it's just something that naturally happens when "the honeymoon is over". Us guys start paying attention to the more serious things in life, but the lasses wanna go back to it every so often just for a little bit. That or they have some emotional security issue that's not being addressed and we're too busy to pay any attention to it.
So don't be writing off the choleric guys just yet.