Thinking people in their late teenage years and young adults aren’t mature enough to do some of those things is just a big tell of how bad we educate them rather than their brain not being “developed”.
Consent is the most obvious example, teenagers are gonna have a sexual life no matter what you want them to do. Removing consent just remove yourself from the responsibility of educating them and entice them to stay hidden.
Driving is also just necessary to anyone working, again being safe just need to be taught, plenty of adults are just as immature and stupid.
The same can be said for drinking or smoking, prevention is so much more effective than restrictions.
However, for voting or joining the army that’s when i agree. Because the system is built to prey on them, making sure they stay uneducated and vulnerable. So only then does having restrictions make sens to keep them safe.