The first primary reason that I can think of is reassignment after taking a haste decision. Taking an action without figuring out the conclusions can cause depression. Moreover, the defeat would have mentality effects. The defeat would be disregarded after a long time no matter critical/simple decisions. For instance, an intimate friend of mine planed for a journey to France but before getting a tourist visa he booked a room for 15 days and paid airline ticket. He did not come qualified for the visa and was not able to get his money back. If he had waited for visa first, he was able to save his money!
From the economy angle, the other drawback which cannot be neglected is the expected expenses for taking a haste decision. As a result, going back to drawing board always costs money. On the other hand, compensating for money tends to be available but what about time? Even if you do not believe in them, they are difficult to be ignored. People said quieted: “Time is Gold” which means nothing would be considered as valuable as time. Loosing time and money would be doubled since the person should start from the start point. There are myriad of ways for saving money and time favor of researches and contacting experts in the related fields.
Haste makes waste. We are not machines. We can't rush through things mechanically. If we do, we might forget something; we might take shortcuts. By taking our time, we can do a chore carefully, completely, and correctly.
In the contemporary world where everything is happening so fast. Everybody rushes badly to get there things done faster. As it’s said 'Haste is Waste ‘this is very true in some cases but in today's world all the things are moving so fast. So one has to be fast to get into the competetion, though it doesn’t mean that, you should become impatient and do the things hastily and just mess it up. On the other hand there are people who still are moving slowly and