Application windows - per space/desktop?

same question! (posting here in case you get a reply!)

My question is, why can't I user-define the interface to allow me to see All Windows of an App, but ONLY those I have open in a specific Desktop (rather than every single one open, across all Desktops)?

This was possible with Spaces in SL, or no? I think yes.

For example, I have 8 Desktops, each with a different purpose:

Desktop 1: communication-mail + skype​

Desktop 2: social media​

Desktop 3: my blog + tumblr + etsy shop​

Desktop 4: photoshop, misc image apps, iphoto​

Desktop 5: image research, pinterest, blogs of interest, etc​

Desktop 6: my wholesale suppliers, amazon, etc​

Desktop 7: Outright (accounting), Square, online banking​

etc etc etc

I therefore have Safari windows open in several of my desktops. I have "View all Windows" as a hot-corner (Exposé hangover), but of course this means I see ALL of my Safari windows, regardless of content/desktop. THIS IS SO MESSY. I don't want to look at 15 tiny windows, when I USED to be able to see the ones JUST open on the desktop I was on. I desperately miss being able to see "All windows," and even swiping up to Mission Control just gives me a stack of MESS.

Thoughts? Is there a work-around???

Many thanks.

---Dianna