It was more than sad and annoying. It probably helped to delay completion of the investigations by the Dutch safety board and by the JIT.
Late on the evening of the day on which MH17 was shot down, a Jane's representative told the BBC that the likely culprit was a Buk launcher, perhaps operating in solo mode without the normal support of a Command Post (CP) vehicle and 'Snow Drift' Target Acquisition Radar vehicle. Nothing subsequently emerged to suggest a viable alternative theory.
However a growing number of ill-conceived or even deliberately-misleading theories on how the aircraft was shot down did have one unfortunate effect, a source close to the investigation told me. As each emerged, the investigators had to add it to their workload. There had been no shortage of claims that the investigators were overlooking evidence that supported alternative theories. So although the recovery of recognisable Buk warhead fragments from recovered bodies had been an early indication of how the aircraft was downed, each theory (no matter how crazy) had to be officially considered, then investigated to the point where it could be disproved and dismissed.