Dude, sharp edges have nothing to do with ripping your edges out.   Also, the idea of using 'protecting your skis' and 'sliding rails' in the same sentence is completely false.   You destroy your skis when you hit rails, full stop.   If your edges rip out on the first go, then your skis suck.
Also, yes you're right you can catch with sharp edges.   I don't recommend hitting a super technical rail on your fresh edge, but a couple of flatbars later and you'll be fine.
Trust me.  When I was an athlete I would go through at least 4-6 pairs of new skis per year, and when I was reviewing park skis heavily I would try anywhere from 7-14 new pairs per year... sometimes more.   Every single time each one of them had super sharp edges, and every single time I simply detuned them by taking 2-3 runs of sliding simple boxes rails to do the detuning.
The only time I'd say you absolutely need to detune your skis is if you're about to do a contest and you need to take a completely fresh pair in with you.   Then, its key that you have absolutely no issues so just take a file/piece of concrete/tree/fence/disc grinder or whatever to 'em and go to town.