If in trading apply fast trading strategy,
What obstacles are constraints
and weaknesses?
If you are terming day trading,then its ok until there is fluctuations in price out of which day traders make quick profits.But if you are mentioning just buying fast and immediately selling fast without any price analysis and strategy,then it would be a stupid act leading to loss.Even if you want to hold any coin in short-term,still it would be profitable only on selling it when the price increases.
I think this is not the strategy and not a perfect decision to handle things like this, even this is not useful in traditional trading. We have to be careful in this market like a duck siting on floor and have to wait for increase in price, once increase in price occurs then that is the real time to sell for profit. Especially in the Bitcoin this is a failed idea to buy fast and sell fast as it is long term and will take our time.