As an American, while I know the tradition started in Scotland, I feel our Halloween traditions are intermingling with the previous and original traditions.
I moved here six years ago, Halloween wasn’t nearly as big as it is now. I don’t know if that’s just the intersection of American culture with UK culture, or if its a natural progression. However, I do miss the Halloween culture in the States. Full blocks of homes are decorated, people take their kids all over the area, on foot, on bike, etc. because its not about the candy/sweets but its just fun. We’d have state fairs around the same time, you’d go to amusement parks where you could trick or treat and go on rides. It’s a very different atmosphere.
If a child knocked on my door from a different neighbourhood, I’d have no idea because I don’t know many of the kids in my area. However, I don’t let them grab, I hand out candy to them. And, I do make them say trick or treat, or tell me about their costumes. It’s how its done at home. This year, if I wasn’t about five days from my due date, I’d dress up in a costume myself, and greet the kids with a scare! 
I’ve got a black cat and everything!
Finally, when I was a kid (like over 20 years ago), my parents never needed to come with us for trick or treating. All of the neighbourhood kids were out, and we’d kind of run where we wanted. My parents set ground rules, about certain homes we weren’t allowed to go to, and my oldest sister was somewhat responsible for us. It was fun, sometimes my cousins would come in from Chicago or a more rural suburb, to our more densely packed suburb, and ToT with us in our neighbourhood as they lived in apartments and it was harder for them to ToT. There’d be hundreds of kids around, and a few times my dad would need to bring home more candy on his way home from work! Then we’d go home, our parents would inspect our candy, and let us eat what was left. I now realise they took some for themselves, I’m guessing their “cut” from our takings for buying/making our outfits, and dealing with all the kids screaming at their door. 
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Halloween is fun, I still get excited and I’m in my thirties. I’m looking forward to taking my daughter around. This whole, you’re not from my neighbourhood is just sad. Yes, I understand that it means some houses can run out of candy/sweets. I understand that frustration. If you have an idea about certain areas that send their kids over, talk to the locals and ask them why, and if they’d look at organising for their kids like a party or something. Or a joint party, where everyone contributes.