I have used MXF4mac for a long time, so I uninstalled plugins a long time ago. Canon footage does work without installing anything extra in FCPX 10.1.4, so yes, if you want to use Canon MXF footage, you may have to uninstall the plugin.
I don't see a reason why you wouldn't do this. It is one less useless copy of the material, you can still create Optimized or Proxy material if you need it. I have been editing with native MXF files in Fcp7 and X, and there has been zero issues or downsides.
I had the same problem. I have fcpx 10.2.2 and I deleted from my system both the xavc plugin and the rad folder but when I open fcpx it still seems to have the plugin installed. I'm going crazy!
What I can do now?
Please help me. I what to read as native files the MXF files from my Sony FS5.
I just started using the Sony A7s, which also uses XAVC format. I installed the plugin from Sony (PDZK-LT2_1.2.1) and I started trying to bring the files. I also saw some third party workflow where you convert everything to quicktime using the "Sony XAVC Converter for Mac", I hated this idea because I don't want to waste more time and disk space than I have to. I used XDCam for a long time and one of the things you can't do with XDCam is mess with the folder structure the camera creates on the card. But one of the things I noticed when working with Canon 60D was that when I maintained the card structure FCPX thought that the folder, even when located on a hard drive, was a card in a camera and force itself to make "optimized media". I'm not a fan of this because like I said I want to save disk space and time. So with the Canon I figured out that if I break the card structure by renaming the folders "xDICM" instead of "DICM", nothing fancy, FCPX no longer thinks the folder is a card and I can "leave in place" the files instead of transcoding. I thought I'd give this a try with the card structure of the Sony A7s, and this actually worked great as far as I can tell. The files work fine in FCPX (10.1.3 and 10.1.4), and I don't have to bother with transcoding anything. On the card there are lots of other folders and files, including an ".XML" file accompanying each ".MP4" file, but I just ignore (but maintain) all that and put the video (.MP4) files into a separate folder. I did it on my first project with the Sony A7s and it worked perfectly fine. If anyone knows of any unintended consequences this may cause I'd like to know. Also, does the F55 card have the same folder structure as the Sony A7s, since they are both XAVC? If they do maybe you should try what I'm doing.