What does a high conviction rate have to do with this? Maybe we should turn it around and say that other jurisdictions' prosecutors are wasting money prosecuting cases they are not sure of?
If you trust prosecutors to not be corrupt, be well trained, and do the right thing - they should be a better place to throw out flimsy cases.
Of course, as others have said, the reality is that prosecutors only go to trial if they have what they view as a guaranteed conviction, and the evidence is typically a confession.
During my travels I was advised to be particularly cautious about treating police courteously and following rules to the letter because getting arrested is a much bigger deal than elsewhere.