I noticed this too on my Grim Donut experiment (83° STA). Since the saddle is more forward and higher up:
- could bump into the saddle when hammering out of the saddle on flat ground. Not a problem on a climb.
- couldn't stand in front of the saddle at a stop sign/light, and also have a foot on the pedal.
- a bit more inconvenient to mount the bike. I would rely on using the pedal to get on the bike, rather than mount in one fluid movement like a CX racer would.
A dropper post remedied all these issues. It's a must, preferably with enough travel to allow the rider to place feet on the ground while still sitting on the saddle.