If improving passing in your big men improves your team's performance, then it is worth it. It has been for my team. I spent the first six weeks of last season training FT shooting. Last year in the Finals I won the title on a buzzerbeater in a game where I shot 18-21 from the line. Efficient training? Probably not in most people's eyes. Good for my team winning the title? Undoubtedly.
So it is up to you. If you are training your big men to sell so you can make money on the TL, then remember that the Tl list is searched by lots of dummies who think an unbalanced scoring machine is worth millions.If you are trying to create a winning team, think about the skills necessary to win in basketball.
Once I scored a basket that still makes me laugh.