Yup and then I have a startup script that asks me if I'd like a GUI. Saved me setting up a display manager and it's basically the same amount of effort when logging in.
Yeah, that. Opaque means no transparency. Easier to read/work, or see a picture/video without background stuff mixing in with it. But for my non-focused windows, I'm not actively working on those, so rice it up, transparency all the way! (but still add blur to those, just so I can read them if I need to....)
In school I had a physics teacher who thought it was a good idea one day to use whiteboard markers on the glass windows instead of the whiteboard. I didn't learn anything that lesson.