Thanks for making this point. It hadn't occurred to me before. I am a desktop junkie because I want to monitor things like Slack, Spotify, etc. on my secondary,

Thanks for making this point. It hadn't occurred to me before. I am a desktop junkie because I want to monitor things like Slack, Spotify, etc. on my secondary, and find it hard to cope on notebooks with a single screen. But, you're right, some transparency would really help.. now to figure out how to do it on OS X :-)