That will have it's own set of issues. If you pop your ring and no one else does, you will level faster than everyone and ruin their exp. Even if they all decide they want to exp. fast like you, You will also out grow camps super fast making it so that instead of spending time fighting, you will spend most of your time traveling to different camps (which has nothing to do with gaining exp. or learning your job). There are already a lot of people who have most of their jobs leveled beyond a certain point, which means that you will probably have to level synch. Which means that people won't be learning anything about their abilities as they level up because they will be capped to a lower level and unable to access them.
I could go on for days, but I think you get the point. Low level experience points parties are pretty much a thing of the past. The only way that form of leveling will ever be relevant again is if SE somehow creates a huge influx of new players coming into the game that are attracted to the game because of this newly introduced feature that allows them to level at a rate that is 10 times slower than the one that all the current players got to use. Who knows though. Maybe pigs can fly.