... If are flying somewhere that you think prop guards are the answer, you are probably flying in the wrong place.....
That's a huge over generalisation. And can just as easily be reversed - unless you're flying somewhere where you couldn't ever need a guard, you should be using them.
Generalisations are a poor way to argue, and generally very easily countered.
Not everyone flies in wide open skies miles from obstacles. And no one ever plans to have an accident, they're always unplanned, so using a guard unless there are very specific reasons not to, is just good sense. If an accident does occur, it can save costs, and potentially save injuries, and having seen the scars and stitches an S1000 caused to an extremely experienced pilot, injuries can be quite significant and occur to anyone of all experience levels, because mechanical devices can fail and do unexpected things. His did, and the cuts were many and deep.
I use quick release ones that are 3D printed by MortarArt, they're very light, behave much less like sails, weigh very little, and I use them whenever there's no specific reason to leave them off.
I leave them off when I have a specific shot or video that I need where they'll likely get in the shot. I also leave them off if I absolutely have to shoot despite winds being borderline, and they will be the difference between surviving the winds or not surviving, or when I must absolutely stretch every last second of flight time out of a single battery.
Those are the main reasons for NOT having them, but there are at least as many reasons TO have them.
Basically I think take each flight on its merits, and decide at the time. But writing them off because of some sense of pride - "I don't need them" - or because you believe everyone should only ever be flying in wide open spaces miles from anything and anyone, is at best a little naïve. The law here states 30m from people. Start having mechanical or flyaway problems with a Phantom mechanically and it can easily cover that legal 30m space and fly into people that you're perfectly legally allowed to be near, and those of us who use ours professionally can't possibly work on the principle that you're in the wrong place if you need them.