To be honest, I wondered two things: if people felt the ride-quality attributes of titanium were maybe only particularly relevant for road bikes and less relevant where tire width and road buzz not a factor. And if the attraction of ti bike is strongest when they buy it but it faded over time and folks returned to carbon or steel, as if the ti desire was less about ride quality than they’d thought.
Titanium, like steel, can be stiff or noodley depending on tube diameter, wall thickness, geometry, and alloy. You can't say a certain material will ride a certain way.
The whippiest, wet noodle I ever had was a Landshark made from standard diameter Prestige steel. Great bike for someone 50 pounds lighter than me. The stiffest, most bone jarring bridge girder I had was a Tesch s22, made from heavy gauge, oversize True Temper steel.
I have a Seven ti frame. While it's a great bike it doesn't have any "magic" ride quality. It's quite stiff and broken pavement is quite jarring. I rode a friend's Moots Vamoots and it felt like a spring compared to my Seven. I also have a steel Gunnar and it is more compliant than the Seven but it also has a 3 inch longer wheebase and slacker head tube.