It's a balancing act. It depends on what the area is like (some are rougher, some have more busy roads etc), what the local community as a whole considers "normal", how mature the child is etc
But having said all that I have to say generally I agree. My dd is now 17 working full time and pretty much capable of running a home, whereas she has several friends who are incapable of making a cuppa because until quite recently (and some of them are 18 she's one of the younger ones) they weren't ALLOWED to use the kettle! Let alone do their own laundry or make a basic meal. Some of these are due to go off to uni in the next few months and I can already see they're REALLY going to struggle to live away from home.
Dd was always an "outdoor cat" so quite happy popping to chap friends out to play etc. Since 14 she's been getting the train to the city with other friends raised in a similar way (with the ones who weren't allowed to even get the bus into our very small, relatively safe town a mix of jealous and shocked).
In addition I've noticed the ones raised with no freedom until they hit 18/19 and leave home, when they DO get that freedom, they don't know how to handle it and go a bit nuts - all night benders, frequent ons, running out of money for bills before the end of the month and then running up debt, gambling etc
Yes we want to love and protect our DC but it's our purpose to raise them to be independent functioning adults too.
That includes using the Internet sensibly, being considerate of others, having the strength to say "no" in awkward situations, risk assessment, knowing what to do in an emergency.
"Well no, but a kidnapping is." Geez! Kidnappings are INCREDIBLY rare and again - usually carried out by someone already close to the child and usually the result of custody disputes. You can't live your life in fear of very very rare events you'd never do anything.
Traffic issues as a fear are FAR more realistic and understandable.
"A lot of threads about 15 to 19 year olds I've seen recently I immediately pressumed the OP had meant 5-9 and added the 1 by mistake." Yes! There's one just been started about "is it ok to let an 18 year old go on a 100 mile bus ride" that's an ADULT for crying out loud!
"The world is a more dangerous place than when my children were small." Except it's not - again with the possible exception of traffic issues.