what_goes_up - from memory ICAO Doc 8168 concerning "aircraft flight procedures" has a section about operations on parallel or near-parallel runways. I take it you are referring to operations on runways 32 and 34 at Zurich.
If that is the case it doesn't surprise me that the Swiss CAA is nervous about separation between departures and go-arounds.
Here at Heathrow we have had our share of problems with this in the past and we have parallel runways. Our missed approach procedures used to involve climbing straight ahead, then proceeding as directed by ATC. Inevitably at times of high workload things did not always work out. The solution has been to construct missed approach procedures which turn away from the departure runway then at least one aspect of the event is predictable.
At Manchester airport where they have closely spaced parallel runways there are warnings on the SID charts that aircraft may be instructed to turn the opposite way from the planned route in order to establish separation from an aircraft going round from the other runway.
With converging runways there is also vortex wake separation to consider if the predicted flight paths will cross. A heavy departure from one runway and a smaller aircraft going round from the other may have an encounter if it has to pass behind.
Hope this helps