I'm always removing plug-ins that I don't need anymore. I try and keep them to a bare minimum. I even make sure to upload optimized images but this plug-in, is awesome.
You can go thru and Smush all your previous files (although not in batch) and it does it automatically from the install forward.
Reducing image size is awesome! What a fantastic plug-in.
I'm sure I'll remove more as time goes on but this won't be one. It will be a core plug-in for sure.