first time I saw people using spaces other than tabs I couldn't believe. it takes one click for tabs while three/four for spaces. I think it's only matter of personal preference and you will not change other person states of mind.
This is a common misconception.
No one presses their spacebar 4 times. The tab button inserts spaces to the next tab stop and shift-tab removes them to the previous tab stop.
Well, maybe most of the people use like this, but I saw people hitting space.
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