You'll learn to love it. One car has a panoramic moonroof and the other just a small moonroof. With the panoramic, I use the tilt function with the sunshade 90% closed, I find it useful when it's hot outside, and in the hot late afternoons/ evenings I fully open the moonroof and it's just purrfect... up to 100 kph. Beyond that it makes too much noise so it stays closed, but that depends on the car and the design of the system.
The smaller one in the other car, there's virtually no difference between open and closed sunshade.
Yeah, it adds weight in the worst place possible, but on most cars it's worth the extra natural light in the cabin.
Interesting. VW AG use a billion types of DSGs, but I think both the old Golf and your new A3 have 7-speed "dry-clutch" transmission which in start-stop traffic, compared to "wet" 6-speeds, can be quite jerky according to the Internet. Might be worth checking the software version on yours.
--- Post Updated ---
I did not say that.