Note that spectator interference in ball golf rarely results in a no penalty/penalty swing because they don't mark spectator areas as hazards or OB. Most of the grass playing surface of the course is inbounds and spectators are not located near water hazards in or bounding the fairway side of lateral water hazards.
Players even get free relief from TIOs (Temporary Immovable Obstructions) such as tents, viewing stands and camera towers which includes line of sight relief to the side, not just physical obstruction relief. The player's ball typically would have ended up in the rough with or without spectator or TIO contact with a ricochet into a sand trap sometimes resulting in a slightly worse lie than rough. Either way, there's not a full penalty stroke swing in play from contact.
I believe every one of our spectator, cart, spotter, official, water bottle incidents with social media discussion about the good or bad break, involved artificial full stroke penalty boundaries that were "unnecessary" additional penalties. No need for cart path OB and across additionally penalizing throws that were already errant or fluky rollaways that may cost another stroke if the player can't make the save (like landing in rough and sand traps in golf).
For Hazards, give the player the option to either play from their lie in the sand with a stroke penalty or the more sporting (ball golf-like) option to move back on the line of play to the edge of the trap with no penalty and try to save a stroke by making it from there. It still doesn't excuse that rangefinder volunteer from being in a place to interfere with AB's shot, but at least AB would have had a chance to save the penalty stroke attempting a longer putt from trap edge on the LOP either from where the disc contacted the volunteer or from where it landed if it wasn't clear that the disc actually contacted the volunteer.
