As for the typing itself, just curious, were you a Blackberry user in the past? I was for 15+ years, but I've never used a Unihertz. But my typing experience was always running circles around every poor soul with a touch keyboard.
As to the rest - I owned one of every model of BlackBerry's Android PKB phones and none of this was an issue, so I'd say a lot of it may be Unihertz's execution. Losing navigation functionality with a PKB? That's shocking, you should have _gained_ advantage rather than lost anything.
Makes me almost happy I haven't gone for a Unihertz when my last Key2 croaked.
Not the person you're replying to, but I was a big BB user in the 2000s and had the Blackberry Passport briefly in 2015 to test its Android app compatibility (it was pretty damn compatible!).
What I discovered was that the best BB keyboards for error-free typing were the curved 4-row keyboards on the Bold 9000, 9700 and 9900. The Passport kb was flat, rectangular and only had 3 rows over a very wide layout and placed at the very bottom of the phone, making it cramped to type on. I love the idea of keyboard phones but only BB of yore did it right.
Yes, I was. I had a physical-keyboard phone for as long as I reasonably could.
What I realized is modern soft-keyboards are actually exceptionally good handling slight miss-clicks. I stopped worrying about hitting the key exactly and just punched it close enough. Auto-correct seems able to figure out that 5% off of a key should be weighed as that key being hit and gets the word right.
With a hard keyboard, I'd just end up with total garbage sometimes.