Another example of a motorcycle manufacturer offering a "comfort" seat for sale after the bike is purchased. BMW has been doing this for years and most of their customers ask: "why can't they just install the 'comfort' seat on the stock motorcycle?" The answer probably has something to do with $$$.
My 1999 BMW K1200LTC came stock with the comfort saddle. The two lower tier models did not. More than a few people complained that the extra cushioning of the comfort saddle meant they couldn't flatfoot the bike at stops, so in subsequent years they charged extra for it no matter which trim level you ordered.
On a touring bike, people wanted a seat that was more comfortable for the 1% of the time they were at a stop, and not the 99% of the time they were actually riding. I've NEVER understood this. Anyway, perhaps the other manufacturers saw what happened with BMW and followed suit? Your guess is as good as mine. "Comfort Seats" typically would have more foam and sitting in the showroom it makes potential buyers feel "less secure." And that's probably the REAL reason. Those of us who actually know how to ride don't give a crap what it feels like on the showroom floor, we take demo rides to see what they feel like on the ROAD.
BTW, the Zero stock saddle doesn't bother me in the least. By the time it's starting to get uncomfortable, it's usually time to find a charging station and plug in. That's the way it seems to work for me anyway.