Here's why:
* Emphasis: "Loudly" is often used to emphasize the action or statement being made. It can add a sense of force or urgency to a sentence. For example: "He yelled 'Stop!' loudly."
* Redundancy: If the verb already implies a loud action, using "loudly" can be redundant. For example, "He shouted loudly" could simply be "He shouted."
* Alternative word choices: Depending on the context, you might find other adverbs that sound more natural or convey the desired meaning more effectively. For example, "He spoke with a booming voice" might be better than "He spoke loudly."
Ultimately, the best way to use "loudly" at the end of a sentence is to consider the context and whether it adds to the meaning and clarity of your writing.