why do we wait for a break of a zone?

why do we always wait for price to break zones before placing our trades? because we know that we have multiple levels of buy and sell pressure in that zone so we have to wait for buyers or sellers to win in order to give us the direction of that currency. so if price breaks our weekly zone to the downside we can say that sellers have the power and then we can look for trades to our next zones of buy pressure. in the zones there will be lots of buy and sell limit orders as its a historical level, we don't want to place our trades in that area as normal market movements will more than likely stop us out so we like to put the odds in our favour and wait for the break and price action confirmation before placing our trades.