These existed shortly after the iPhone came out under the presumption people would miss the physical keys from blackberries. They didn’t sell well back then I don’t think they will now.
I still don't understand why PDAs are no longer a thing. Make a phone a bit thicker, add ports, thumb keyboard... I remember being able to SSH to servers from my Zaurus and actually do things using the hardware keyboard. Or SSH to my n900 and install packages there. With android I just lost the interest. It doesn't feel like a personal computer anymore.