Campden is about risk, but also about the price you are willing to pay to manage the risk.
At the beginning of the ferment, the risk of infection is very small unless the juice has been mishandled, and usually there are some indications in the smell and taste that this has happened.
After the ferment, the risk of oxidation is fairly high if you keep the cider for more than 6-8 months.
The price you pay is the taste. Its true, you dont see a lot of posts complaining about k-meta. What you see is a lot of posts complaining about bitter cider and why it takes so long to be drinkable. Instead of questioning the "conventional" wisdom and trying to fix the process, there is all sorts of advice on backsweetening, which IMHO is what you do to salvage a failure (which I still have to do from time to time), but doesnt belong in the recipe.
For anyone who does not believe that there is a taste penalty for using campden/k-meta, I encourage you to do a side by side comparison for yourself with two gallons of your favorite unpasteurized juice and yeast. Add k-meta to one and not the other. Taste them before and after the ferment. I can guarantee you that the one with no k-meta will taste better - you will have more apple taste, a bit more complexity of flavor from the wild yeast (although the yeast you pitch will still dominate the profile), and will be able to drink it sooner. If your goal is to stash the cider away for a year, then sure, use the k-meta, but I would still advise using it after, rather than before the ferment.
Last season I experimented a lot with k-meta. I even did 16 single gallons of the exact same juice and yeast, with varying amounts of k-meta before and after ferment, and drank a liter of each at a couple of tastings. Nearly everyone can pick out the taste of a full dose of k-meta. Most of my brewing friends could distinguish half a dose at the first tasting. At the second tasting, the k-meta was less pronouced, but the batches with zero or half a dose before the ferment still scored consistently higher than the ones with the full dose. The taste of sorbate is even more pronounced. Everyone could taste it, but not everyone found it objectionable. Some people liked it. I'm planning to drink the last 16 liters this November - after they have aged for a year. My expectation is that the ones with little or no k-meta at the beginning and half a dose or more at the end will score the best, while the ones with no k-meta will have got vinegary after a year. I hope the sorbate taste will have faded as well, but my guess is that it doesnt.