Finally got to view your vid, and good job again, as always. And as you mention these are minor niggles which don't take away from your love of the car overall. But I don't agree with some of them, or maybe my Ioniq 6 is different.
First the regen and use of I-Pedal. I like mine just as it is. I use level 3 regen and auto regen, and don't want the car to come to a full stop unless it is on cruise control. I step on the brake for a full stop, and release it to creep forward, to make it work same as my previous ICE cars. The only time I use the paddles is to reduce regen in slippery conditions. If it is really bad like in ice and snow, I put it in Snow mode which then also reduces regen.
With the shiny black I don't seem to have that issue and have been through two winters with my Solterra (also has the shiny black trim) and one winter with my Ioniq 6. I do have a ceramic paint coat on my Solterra, and a graphine finish on my Ioniq 6 so maybe that helps.
I have never had an issue with my 12V on the Ioniq 6. I see the yellow charge light on the top dash come on regularly, pretty well ever day, and I also have a BM2 which shows it being frequently charged and kept full. I have had 2 ICCU updates, if they made any difference. On my Solterra, when I first got it, the 12V kept discharging, but Subaru replaced it and no problems since.
I do miss wireless Android Auto on my Ioniq 6 (have it on the Solterra), but have found the onboard mapping to be fine for my use. I do occasionally plug in my phone to use Spotify and there is a convenient wireless charge space in front partly under the dash, so no issue with that.
And no problem with my rain sensing wipers. They work well exactly as I would expect. And are used often as I live in Vancouver. I use the sensitivity rotating knob on the stalk one position below max. My Solterra auto wipers work well, too.
The one big thing I do miss is a digital rear view mirror. I have that on my Solterra and comes in very handy when the rear window is frosted or covered with frozen snow. No need to clear, just drive off and flick the digital mirror switch and let the defrost eventually clear the window. It also has a washer on the cameras back there, so no dirt and grime collects there when on mushy wet salted roads.
That's about it. Will look for your next one, always worth a watch.