Seems practical... it saves making a second meal, it reduces the chances of the meal being poisoned, it makes the servants happier - and more available to serve if called upon because they're already right there. I mean, at some point a good servant is sort of 'working family' anyway.
Yes, family meals at the dinner table are ideal, although sometimes hard to manage. There are several benefits of family dinners. Families get to sit and talk with each other for a few minutes, enjoying each other's company and finding out about each other's lives. There are fewer distractions such as television or phones, so people pay more attention to their food, enjoying it in moderation. Dinner should definitely be a shared event.
Medieval Europe was an interesting time, but perhaps most unusual was a custom that has unfortunately gone out of vogue: the habit of eating meals as an entire household. I think it's time to bring that custom back, and for families to start eating meals at the dinner table together. This encourages lively discussion and helps family members get to know each other, which strengthens family ties and restores the health of society as a whole.
It's nice to have a meal with the family at the dinner table, but there are many reasons why that is not always feasible. In many families, people have different schedules and therefore eat at different times. Some families would rather eat in front of the TV, which is not always a bad thing. Some people live alone. We live in a very different society now than we did back then.