Originally Posted by
slowrevs
...There were no plans to attempt gearing with the belt drive, and he knew of no attempts by anyone at the time.
If you want to do a lot of riding and one speed is sufficient for your needs, then I guess they are all right..
Singlespeed on a belt-drive is a joy. It's one of the best and easiest use cases.
For gearing, you need something internal like a gearbox or a geared hub. Then you begin to have tradeoffs that enthusiasts such as ourselves will obsess over way more than will a casual rider who just wants a bike in the garage for a sunny day.