If tools are evaluated by their leverage, and if Slack needs less effort (in form of training, etc) to achieve the same result as email/IRC, then isn't it reaso

If tools are evaluated by their leverage, and if Slack needs less effort (in form of training, etc) to achieve the same result as email/IRC, then isn't it reasonable to suggest that Slack is better? However, I think it is interesting to think about the method they used to achieve that increased leverage. In Slack's case it may not be an entirely new set of features, but just more optimal designs and implementations of existing feature sets. Should that necessarily "count for less"? I would argue no, if tools are evaluated by their leverage.