People who are passionate about something are generally interesting people. They know the obscure ins and outs of the thing they are passionate about. You can learn a lot from such people. At least, that's what I always felt.
OP is only talking about people who are too involved in what they are doing, and not people with a lot of passion, and so this having bad effects on their life with neglecting the other important part of their life.
If it’s to be work by being workalcolic, video games, music... and being so involved that kids, family, and friends are neglected. To education when they are in high school or college and playing video games which I did myself, and their future is neglected.
I also saw first hand parents loving so much their job and their career that they were neglecting their children to the point where their kids were starting to show warnings and sometimes alarming behaviors.
Also as a side note we can be strongly passionate because of something outside being really negative in our lives so our hobby or anything is our way to escape that and do something for ourselves. Now that can be good. But. We should remind ourselves in this case that the long term solution will be to address the problem first hand and not to escape it even more, if it’s to hobbies, work, or anything.