I wouldn't exactly call those lines "vents." They are actually atmospheric pressure reference lines. The slide in the carb moves back and forth because of the pressure differential between the venturi and the reference chamber behind the flexible membrane that the slide is attached to. I believe there is another atmospheric reference in the carb as well, but can't remember where at the moment.
That reference chamber is vented (oops, I used the word "vent" after all) to atmosphere.
So those pods are intended to give a quiet, turbulence-free atmospheric reference for the carbs. Consequently IF there were any problem caused by removing the pods, I would expect them to manifest at HIGH speeds, not low. That's where you could have turbulence or a partial vacuum caused by some airfoil effect.
Eric, the BCM mechanic who wrenched my 6k service last year, said he just cut the hoses on his and tucked them in by the engine and has had no problem. I haven't heard of others having any problem either. Don't know why Ducati put 'em on!
I hated the pods at first and looked into their function and removal. I guess I got used to them

. One thing that bothers me is that if I take them off, I'll still have the frame brackets up there. So I'm telling myself I'll remove them if I ever remove the frame for clean-up and painting. Then all extraneous brackets will go and the welds will get cleaned up.