It's a good tradeoff in commuter purposes. It's not a good tradeoff for racing, which is where most tech is developed. One big tradeoff you missed is efficien

It's a good tradeoff in commuter purposes. It's not a good tradeoff for racing, which is where most tech is developed. One big tradeoff you missed is efficiency. The belt drive is efficient, but internally geared hubs are currently less efficient than traditional derailleur setups. Losing watts to drivetrain loss is a major reason that internal hubs are not as popular with human powered bikes. The durability and maintenance need to be WAY better to get someone to switch over.