So the problem with bitcoins is that it can be harder to evade taxes and buy illegal stuff? I don't know how it is in USA, but where I live it would be very use

So the problem with bitcoins is that it can be harder to evade taxes and buy illegal stuff? I don't know how it is in USA, but where I live it would be very useful feature of currency. However I remain unconvinced even of the arguments that it could be traced.