Having babies with the same name in immediate/extended family

So I see a lot of posts where people get mad that someone else is picking the same name for their baby and they think it’s inconsiderate or whatever. I’m confused as to why it’s a bad thing if like cousins have the same name? Really don’t get what the big deal is. In my culture all babies are named after their grandparents. To not name your baby after it’s grandparent is a big no no. I guess that’s why I’m confused 🤷‍♀️ just trying to understand the issue behind it is all