Ref the bings and bongs which default to on every time you start the car, I did a bit of looking in to this as we’ve been looking at the Ioniq 5 and Kona. According to the internet you can set-up a menu shortcut to switch all or as many of them as you wish off with 1 toggle which would be handy.
Most of the bing bongs on startup don’t happen if you put your seatbelt on prior to starting. The speed bings and flaming bongs can be turned of as you suggest but with the i6 at least you loose speed sign recognition.
You can also adjust the sound level of bings and bongs in the menu, to a lower setting.