I use candles because they are the prettiest to look at and for a discrete time period, tells me everything I need to know about that period. In isolation they are useless (falling star, rising bear, angry chicken, whatever).
You can model continuous signals discretely and still have a fair representation of what's going on. This is the whole basis for digital signal processing which pervades practically every aspect of our lives, TV, CD's, Internetz, etc
What is in question is the interpreter of this discrete information and if you, the trader are a rubbish interpreter of the discrete information that is presented then it's going to come out all garbled and meaningless. A bit like if you were a really cr@p cd player - would you blame the CD for the sound quality even though it's able to provide discrete information at 384kb/s?
Do you sing to the main tune of the song or spend your time listening to stuff up at 20kHz?