The only difference here from the OP's list is I do allow my kids at 8 to the corner shop by themselves and to the park with siblings/friends; however, we live practically next to both of those so it isn't as much as it is for most people.
My 14, 12, and 9-year-old still don't have any game consoles or TVs in their rooms, that's all in the living room, and they all have limits on screen time. The older two have devices they use on their own, but they don't have internet browsers, to use one they have to use the computer that is attached to the TV which makes it difficult to hide anything. My oldest used to have his own access last year, that ended up not working well.
I think it's more about the environment you want and what works best for your home and kids than about how mature a child is or isn't. Personally, I think it took a lot of maturity for my oldest to say that having open internet access, even with all the parental filters that we have, made it too easy and tempting to do things he shouldn't and made him feel off. I certainly don't think he is less mature than his peers by not having open access or screens in his room. It works well for him and us.
OhFlipMama I find it interesting that Fortnite is so popular there - I keep hearing it's everywhere, but neither I nor my kids when I've asked know anyone who plays it. It reminds me of the peak of Minecraft when it seemed everyone's kids, including mine, used it, but then when my oldest brought it up at cadets, he found only 2 other people there played it. I think it, like many other fads, is popular within a social circle, but if in a different one, it can be totally absent and the kids can socialize just fine there too, if they wanted.