Conversion is not the same as conforming. Conversion strips away excess frames to roughly match a desired output framerate. Conforming keeps all the original frames, but plays them back at a different speed. By definition, slow motion is a higher framerate played back at a slower framerate. A framerate will be "normal speed" if it's played back at its native speed, regardless of what that is. So 30p @ 30fps is regular speed, as is 60p @ 60fps, as is 120p @ 120fps, and so on. It's only when you conform these to a slower rate do they become slow motion.
I feel iffy about converting. There's some weird technological voodoo at play that I don't fully understand. Many methods of conversion produce inconsistent results due to the process, codec, or both. You get weird cadence jumps and I find it distracting.
The reason I don't like playback speeds higher than 24 fps is because there is too much information. The "refresh rate" (which is a term for something completely different, but lets forget that for a moment) of information is too rapid, and there is less obscurity between frames. Books are more personal experiences because they reveal no sensory information, only descriptions, and when you approach certain aspects of visual art with the goal of hyper realism (high frame rate output, 3D, unnecessarily high shutter speed), you kill the illusion; you leave less to the imagination. Art intrinsically has a mystical and fictitious relationship with the viewer, where we as the artists provide "anchors" which are meant to spark an emotive response. But if you overload them with so much information that the process of imagination or inspiration is interrupted, I feel you risk compromising that emotional connection. For the same reason that silence in music counts just as much as the notes, you need to respect the viewer's imagination and let them take over a little bit, even if only for a fraction of a second at a time.