What is the advantage of the slideout keyboard? It might save some pixels while you type, but it looks very uncomfortable.
It's only if I get into the infrequently used symbols that I have to check what I'm typing.
In a quick online typing test I get around 60wpm/300cpm (characters per minute), 0.0% errors.
It's been long enough that I can't guarantee it, but I recall it being very comfortable and fast to touch type on a Danger Hiptop as well.
touch typing on a virtual keyboard on a flat glass screen is hard because they keys are less accurate and don't give you feedback to whether you actually hit a key or not. So you CAN touch type on a screen, just with errors. Way too many errors. Which is why autocorrect is aggressive on all phones these days.
Back when we had physical keyboards on every phone, we didn't need autocorrect because the typing was accurate.
That was my favorite phone; I wish someone would make a modern version of it.