Thank you for this detailed input. Really appreciate it.
If first generation ICE trains (like the one pictured) can do this since ages in Germany, providing comfortable (jerk-free) rides at much higher speeds, surely this should be possible here as well. Could these not just be technical challenges that can be overcome. Personally, I think that a saving of 20 minutes is worth it. If other trains are also "upgraded", there shall be an all round knock on effect, resulting in greater time savings.