>I run LibreOffice on my Mac and documents ALWAYS render differently than on Word. I always have to proofread on an office computer before I send files out to my colleagues.

If you're authoring the documents, you don't need to use docx. Use a more open format that's supported better by both. As for reading documents, who cares if it renders differently? So long as you can read it that's enough.

>I literally used Bluetooth this afternoon. I was playing music on an external speaker. I also use it to connect my phone to my car, and my friend was using it late last week to play back an audio recording that we needed to pay close attention to.

I was only referring to using your computer for bluetooth, not your phone, since that's the only subject that's relevant to the discussion. Audio is a fair point, though, but I'll point out that I have a pair of bluetooth headphones that works fine with Linux.