Technically, all sound is a movement of air. As a result, you are correct, bass does require it as well, and more of it.
Audiophiles, do like bass, but they do not tend to want it to be less prominent. They go for a 'flat' sound under the argument that it is the way the artist intended. The problem is that this isn't the way that the songs were often intended to be listened to, so the desire for a flat sound doesn't make any sense to me. Music on CDs, .wav files, .mp3 files, etc. is often designed to play well across a wide variety of speakers. An artist can never really know what kind of speakers, or how many speaks you will use, nor what amplifier, receiver, etc. so they have to create a middle of the road 'flat' CD that doesn't place emphasis on any particular sound. However, if you go to that same artist's concert you will likely get nothing like the mix you had on the CD, and the music is often extremely bass heavy. This creates the impression that the artist never intended bass to be flat with all the other sounds. In fact, music created since probably 1950 or so tends to have a strong emphasis on bass.
But the balanced armature sound that so many audiophiles go for can never achieve the level of bass that was intended in many songs by the very nature of how the music is recreated with a balanced armature.
However, all this above doesn't mean much because I for one have never felt it mattered what the artist intended. I grew up with equalizers. I love them. They allow you to listen to music how you want, emphasising this and deemphasizing that. Quite frankly what the artist wants is completely irrelevant. All that matters is that a given listener likes what they hear. If you want treble heavy, bass heavy, or a flat sound it is all good, just don't let anyone tell you that a flat sound is more truthful or better, if you like it, listen to it your way. Its much like wine, the experts will disdain moscatos and ice wines but praising chardonneys and merlots. But they are no better, no more sophisticated, they are just different from each other. And if it tastes good, drink it.
Getting back to your question, perhaps rhetorical: yes, a good seal is important, and by the nature of a dynamic driver design, if properly made, will always produce better bass than a balanced armature. Regarding a rear vent, there are several that have vents in general. The Hippo VB noted above has a screw on the end of it that adjusts the bass quantity by altering distance and air pressure, VB = Variable Bass. Generally a larger millimeter driver will deliver more bass, but not guaranteed, the air chamber, the vents, the distance, the materials, they all factor in.
The Velodyne vPulse is highly recommended by many but I didn't like the bass or the earbud. It was very uncomfortable and I couldn't get a good seal, a common problem with the vPulse and likely contributed to my feeling that it had a lack of bass.
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