Experience always starts at losing that's why it's better for me to see newbies having a tough run while they progress.
I agree with your points of view. Mistakes improve a man's knowledge and experience. It is important to learn from your mistake and if you make the same mistake simultaneously then you are not concentrating. Every time a trader makes a mistake a short note about it should be taken so that he can improve his strategy by finding out the reason behind that bad trade.
but experience could be obtained by other means like reading other experiences, its not always needed to have first hand experience to be able to contain any problems.
because after all thats gonna be expensive experience to learn and not everyone could afford that.
its also why its better if we could just learn from other mistake, to keep our capital from decreasing, and also to be able to have higher chance of proffiting.
there's reason why many veteran trader recommend to skim through some books first because its essential in increasing our experiences.