I had the "blackberry key one" from 2017 to 2018 and I really loved it. Like the Titan it had a keyboard, but it was an otherwise normal sized phone with a passable camera. Unfortunately it broke after one year, basically it split in half. I was hoping Blackberry would continue iterating on the design and I looked forward to buying a future, sturdier version but from what I can tell they abandoned that.
So... When I saw the kickstarter for the Titan I was excited. I have one in my desk but have never used it as my daily driver. I think the author really undersells how bad the out of the box experience is with this phone, sure Instagram stories look bad, I expected that. What I didn't expect is that almost all of the "optimized" apps that came pre-installed on the phone are poorly integrated with the screensize and keyboard. Furthermore, the keyboard is hard to type on! I mean physically, the keys are difficult to press down. I assume if I used this phone more frequently, this problem would resolve itself.
At the end of the day I don't regret buying the phone though. I have been an Android developer for around a decade and it's depressing how little experimentation is done with the hardware these days.