I think that it's intentional the way the Ministry/Hogwarts isolates the muggle children away from their families/friends/muggle culture. The wizards want to stay isolated and keep their little secret world, but muggleborns are a security risk. If you isolate them as much as you can from their heritage, separate them out from the interesting advances they could see in the muggle world, it's easier to get them and keep them in the Wizarding world.

Why do you think hogwarts doesn't teach math or English or languages or anything that would be needed to survive outside the wizarding world? There's no way to get muggle post, it's owls or nothing. There's no way to make a phone call, not even in Hogsmead. Your parents can never visit the school, not at all, they would get hit by the spells to "protect it". But there is no modified version of those spells where you can be invited in? They can't lift them for a single day to have a parents day? Muggle studies is laughably outdated, and there's no real crossover. They say that technology doesn't work around Hogwarts, too much magic, but what if it was intentional? They cast a spell to stop it from working, it's part of the shields?

They take a child at 11, introduce them to a "better way", and only allow brief visits to their family. Hermione barely goes home, she spends all the holidays with the Weasley's after the 4th ish book. Odd, isn't it? Unless the cultural gap starts becoming too wide. You can't really talk about anything with other visiting family. ("Oh, tell me about that boarding school. Do they have a good maths program? Any extra curriculars?") So you start spending more and more time in the Wizarding world because it's the one you know and understand. You can't discuss politics or current events because you don't have access to them for 10 months out of a year. You can't discuss music, you can't talk about what you do in your free time. So you start spending more and more time with people who you can talk about those things with, which means that when you do spend time with your muggle friends and family, you're even more isolated from them. It's a continuous cycle. And I don't think it was accidental.

(recently posted on another thread, but wanted to see what a broader range of people would think. Slightly edited to make more sense out of context, but mostly copied and pasted.)