I think the answer as to freedom within the home depends on several factors. Our previous Golden, River, had full reign of our home after he gained this freedom via age and experience with him. When he was a puppy, and especially during those teething/chewing months, he did his share of damage to remotes, shoes, etc. We never had any experiences with him chewing on wiring, which Brody, our new pup seems to look for.
In time, I allowed River to be in my SUV with the windows cracked on cooler days when I went into a store or talked with a friend for a few minutes
, but I never left him in a vehicle for an extended time. Likewise, when I first began allowing River to remain in the vehicle for short periods, I was usually within eyesight so I could see if he was laying down or sitting up. I wanted to be able to see if he was chewing on the door or scrapping at the door to try and get out. He never did those things, so in time, I wasn't as worried about keeping River and the vehicle in my sight, but again, we never let him in a vehicle for more than a few minutes.
Now we have Brody, an 11-week old puppy. He is into everything his teeth can find. I think this is pretty much a normal trait at such a young age, so he is never anywhere in our home unattended. We're also in the house training stage, so if he disappears even for a few seconds, he's probably sniffing out a place to pee or poo, so when he takes off, we immediately take him outside which at this stage in training is about every 30 minutes when he's awake. When we leave the home for an hour or so, Brody is safe and secured in his kennel (collar removed). At his age, I would never let him alone in the house outside of his kennel for any length of time.
So, as you can probably sense, in time, and through proven experience with Brody, we will gradually give him more freedom in baby steps for longer periods, but for now, caring for him is much like carry for an infant or toddler. Just as with children, you learn through time, observation and experience where your comfort levels should be. You develop kid of a sixth sense so you pretty much know what they are doing at all times. LOL