I have an ID3 and agree with you to some degree. It's not quite unusable, but the touch buttons are high on the list of things I'd like to change.
I'm not that bothered with the layout of the infotainment system, but it'd be great if it didn't slow down and crash as often.
If they had gotten those things right is the ID3 would have been such a perfect little car for me. I love it otherwise. Quick, decent ACC, range is fine for its intended use.
I've got a Kia K5 rental at the moment and I kind of wish I could have brought my ID3. Although charging infrastructure does seem a bit lacking here in the US compared to home in the Netherlands.