I personally witnessed a limb letting go on a curve while a fella was doing the step thru method. The limb flipped up and ripped one very nasty jagged cut across his forehead. He left the range that day in a ambulance...
I know limbs on LB's are more stout and less prone to twisting. I shoot curves myself and never felt unsure of using a stringer. On the other hand, back in the day, while using the step thru method (before the incident) I often felt unsure if I always had the string loops seated in the grooves correctly. I have also used the push/pull method on lighter weight bows in the past. Of the two, the push/pull method seems more controlled, if familiar with how to do it and done correctly.
Stringers are cheap and I have several (house,truck,pack,ect) around. Now in my more "experianced" years, I use a stringer all the time. The risk of damage to the bow or the chance to permently disfiguring yourself seriously outweight the idea to not use a good stringer, in my opinion.
Not a sermon, just a thought...
JL