i wouldnt say there are any arts truely worthless for self defence ery art has somthing to offer the worst for self defence are probaly in my oppinion
xma- since they dont emphasise slf defence
capiora- since its techniques were based of of the idea that the slaves hands were cuffed an well ours arent.also most schools prefer art over self defence hich is just fine
fencing- since u don walk around with a sword most of the time in fact most weapons arts can be put here
wrestling for lack of strategy dealing with weapons while being so in close
these arent truely worthless since they can all acomplish alot especialy if one trains for self defence using these arts however if ur emphasis is self defence then these are less likly to get the same self defence senario results as syestema, krav maga, hagganah,, wemens self defence, hapkido, self defence training style etc.