Magento is complex structure to implement the new functionality using existing code. If you implement any action which can also affect on the entire of system .Just because of that the deleting order directly in Magento database is very dangerous for your work. However MageGadgets exactly does that for you. This extension will allow you to delete orders like single order multiple orders or all orders. This will help you to remove your test orders to look neat and clean your sales grid.
To keep the backend well-arranged and neat:
The appearance of the test orders makes a store backend look like a mess of something which needed to look more neat and clean inorder to do that MageGadgets will help you to make things simpler.
To manage the backend more easily:
The Large number of test orders can confuse store admins and this can make confuse anad inconvenience or mistake in managing. Having a neat and cleaner backend will be simplify to handle order management.