The reason for the flared mouthpieces is that people here got up in arms over some poll where like 6 people deemed flared mouthpieces and bent necks the majority preference on here.The one for the gb-186 is a really good mouthpiece, and if it would just be made a bit smaller it would probably be the best option for people with all different sized mouths.
As for the pillars, this is a closeup of the little glass section some of you have been mentioning. It is nothing more than a splash-guard for the water jets to crash into. No additional percolation. I think it would be a more noticeable difference if the neck came from the top, as a hard draw could cause the water to get sucked up into your mouth, but if you draw hard with the prototype, it just crashes into the top of the can, which is actually beneficial for all those who use cranberry extract as well, since it allows the entire top section to be rinsed and emptied of vapor on the draw if you pull hard enough. It looks like some water would pool around the top section and not be able to flow back down the pillars as well... Not sure tho. One thing it would do negatively to the current design, is take away from the height of the pillar, since it's not just the glass ring, but a dropdown section as well. If anything, the pillars should probably be the same height, or a little taller. I suggested a 1-2cm pillar height increase if possible. I had shown Steven a close up of how the pillar looked in the original design, and he said his guys were going to try their best to replicate it. Not sure if a perfect replica is beyond their skill level at this point, but he did see the original, and produced what he did after a couple tries.
***Edit***
This is a still shot from a video of someone doing a water only draw before taking a hit, off an official Sovereignty Pillar. Note how high the water just shoots up in the top section (it hits the top). It is just one thick jet, instead of 8 individual ones in a ring, which is mostly aesthetic.
Also, for the current FC-186, with a little less water, and a loaded vape attached, there would be a lot less geyser action going on than there is in the water test video.