Well sure you don’t have to convince me, but it’s not very user friendly for basic file operations.
When being “forced” to do this, I find the Tab key (filename completion) more handy than usual because typing long filenames using an onscreen keyboard is slow and typo-prone etc.
Another difficulty is that this is a generic problem across all GUI applications and so, while shell commands may substitute for file operations, there will be other GUI applications where no easy equivalent shell command exists.