Doing evaluative research on "screen v. buttons" you'll find that even on smartphones physical buttons outperform touchscreens. The reason people choose no-keyboard is the benefits a phone brings them as a multi-purpose device outweighs the benefit of "more accurate typing than on a screen".
Creative Selection is a good book to read. It details the process at Apple from the dev who worked on the very first keyboard of iOS. The design of the keyboard + autocorrect needed to be good enough that people could type on it reasonably well. It was one of the credited reasons why the Newton was said to have failed so they put A LOT of effort into this feature of the handset.
Does this apply to a car screen? Probably. A car is also much bigger than a handheld device so maybe you don't have to choose. But in the end great design is always about making good choices.
Creative Selection is a good book to read. It details the process at Apple from the dev who worked on the very first keyboard of iOS. The design of the keyboard + autocorrect needed to be good enough that people could type on it reasonably well. It was one of the credited reasons why the Newton was said to have failed so they put A LOT of effort into this feature of the handset.
Does this apply to a car screen? Probably. A car is also much bigger than a handheld device so maybe you don't have to choose. But in the end great design is always about making good choices.