“Everybody has a plan until they get punched in the face.”
-Mike Tyson

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My carry folders must be one-handed opening. When I open envelopes, the proper technique is to hold the envelope firmly in one hand. What am I supposed to do, put the envelope down or shift my fingers to open a knife with both hands? There's a fat chance of that happening. While I'm not motivated to get the Emerson wave feature (or equivalents), it's tempting. Sometimes I can't wait the extra second to get into my mail.

Seriously though, I do like my folder to be one-handed. However, my gear and dogmas are constantly evolving. In a few months, I might want my carry folder to be a two-handed opener or a slower opener. Unlikely, but it could happen.