In order to reduce the repetition rate, robots usually only automatically modify sentences with high repetition rate, so sentences with low similarity may not be modified, resulting in unsmooth sentences.
Manual modification, if you modify it yourself, it will take more time, which is no problem. In the process of revision, it can also help you better remember the content of the paper. It's also good for your thesis defense.
Robot weight reduction can only be used as an auxiliary means of manual modification. After the robot is modified, it still needs manual modification. In fact, whether students use robots to lose weight or modify it manually, the key parts should be written by themselves!