Although it is troublesome to set up the client for the first time, it is almost unnecessary to set it up after setting it up, which is more convenient to use. There are also many functions that web pages don't have, such as the attachment reminder function, that is, when you mention an attachment in a letter and you don't have an attachment, the client will prompt you to forget to add it.
The client can associate with the resource manager of the local computer, and right-click can directly send related files, which is more convenient.