I'm in my 3rd season of skijoring with maybe 40 full hours' experience. I don't think I've seen actual circumstance where edges were a threat to the (2) dogs. I might personally consider acquiring skis with edges for this sport. This is contrary to standard (& perhaps good) advice. Better control of skis would add (very slightly) to dog's safety, slightly offsetting whatever (also slight?) added risk.
Purely through happenstance, I use backcountry duckbill boots (rossi) and heavy three-pin "telemark" bindings, mounted on a light, edgeless and waxable touring ski. I think my max. ski width is 60 cm. It's a crazy, stupid & brainless set-up. Yet I've come to appreciate the control afforded by the (unnecessarily heavy) Frankenstein boots, given dogs' craziness.
I have also skijored wearing super-light & narrow track skis, & much prefer the heavier set-up. I am a non-skating wax-fanatic, & would probably NEVER consider any waxless technology on my primary skis.
To replace my current setup, a possibly wise retailer suggested I get "Skate" style boots because they are stiffer at a given weight, than "Classic" styles (& thus closer to Frankenstein-style). I have no direct experience. For a ski, the Madschus Panorama T50 was suggested. Supposedly, this has a removable skin & can be used as a "WAXABLE" ski. It also has steel edges & is designed to be acceptable as a track ski and also for moderate/easy BC.