For the most part agree, but it all depends on the setup stats. Things like risk, success rate, frequency, etc. Never say never.
If I have to choose: let my girlfriend trade without leverage or trade myself with high leverage, I know what to choose...... Leverage is only a small part of all the elements that matter in trading and should be taken in consideration. Each element should be judged in combination with all the other important elements.
A trader should never start trading without a consistent strategy and without having researched the market to be aware of the tends. Also he/she should never over-trade and always keep emotions in check.