I got no idea why americans want to ban it, It's not that strong and I feel like ESEA shouldn't take the opinion of mid players so seriously that they ban it. This is just my opinion and personal experience but losing the ability to use pipes is a huge deal as it leaves you very vulnerable and the health boost doesn't do much when you have a soldier with gunboats sitting on your head. When you run out of your 8 sticky's you are completely useless and a sitting duck, if a good scout knows you are running booties they will abuse this. This weapon will probably only be used by people who struggle with aiming pipes but even then they will be at a disadvantage vs demomen who can aim pipes so it's better to just learn how to aim pipes. It might be really good for early mids but I feel like you can counter this and then he has no pipes to spam or to defend himself with.
eeeIf the booties opened up new ways for demos to be better than one another, they'd be much more positively embraced imo
Playing with booties does take a decent amount of skill as you need to play around your huge disadvantage of not having pipes. You need to have top positioning, ammo management ect to be able to use them effectively throughout the game.