Cargo Bikes

I know they're way better these days, and they're pretty much perfected... But they still look like a really crude way of changing gear to me compared to a hub gear with no visible mechanism, just one cog at each end, and one tidy, tight belt or chain... Rather than a stack of cogs fastened to the wheel, with a lump of metal with two more cogs fastened to it, threading the chain over, under, over, around, over etc... Especially with the hideous dinner plate size cogs cassettes use these days.
I just wish as much time, money, and effort was put into internal gear systems as they put into making constant small changes to a very old, exposed, method of changing gears.
Weight is pretty much the only bad thing about hub gears... Even the cost isn't as bad as it initially seems when you look at the cost of top end cassettes and mechs these days.