It's always a happy moment when your baby is big enough to sit at the table and join you for a meal, or at least it's happy for about thirty seconds. That's how long it's likely to take you to realize that your little treasure now has access to the full range of plates, condiments, and cutlery on the table, and has no qualms about throwing them whenever it pleases.
When adults sit and dine together, you can go elbow to elbow. So long as there's enough room to eat your food in comfort, it's a case of 'the more the merrier.' When there's a child involved, they need their own exclusion zone to keep things out of their reach. That means they now have most of the table space to themselves. They didn't come to share your table with you; they came to rule it.