I don't know so much about EGS, but probably some of the following (most of which I don't use very often, I hope I recall correctly)

• Refunds
• Family sharing of games
• Sharing games for other local users
• Being able to lend games
• Remote Play (with friends)
• Remote Play (stream for a local machine)
• Linux support through proton
• probably more?

What do you mean exactly by organic maps editing tools? I was using organic maps before to add businesses, but now StreetComplete can also do that (and more!). I sometimes use Vespucci because it is very powerful, but it's a bit of a pain to use.

Actually, a least some cars (probably more than you think)/have some sort of "emergency" breaking signal, which often result in the usual breaking signal blinking for a while. You need to seriously slam the brakes to see it though. E.g: https://m.youtube.com/watch?v=j_osu1WgGMU

There is also a nice technology connection video talking about braking lights for electric cars and in general, which can be dangerous.

As a first step, I would recommend checking out osm.org from a computer. Once logged in you can use it as an editor straight from the browser. The embedded documentation really helped me initially.