I made the exact same mistake as the OP. I saw the removal of advanced features and assumed either this was yet another move in dumbing down the OS or it was because it was a beta. I didn't however, hold the option key and just start taking potshot guesses at whether which key combination should work. Changing the OS so it becomes more confusing to users, or so that they need to be doing web searches to find information out about the OS is a valid complaint, IMHO.
I don't think that anyone can argue effectively that the original Expose was much better than what they have now. I don't understand why they removed it.
App Nap is another bad idea, but it originated in Mavericks. If you look at all the bad reviews about Yosemite on the App Store a lot of them are complaining that the download stops and then waits for hours to resume. One review even said it only resumed when he clicked on the App Store and made it active again. Most people don't know what this is and what it does, and it just leaves them confused why their system is "locking up." What Apple should do is launch a dialog before entering App Nap and tell the user it's about to do this and give them an option to disable it right then and there, but no such warning exists (at least I haven't seen one).
I don't think that anyone can argue effectively that the original Expose was much better than what they have now. I don't understand why they removed it.
App Nap is another bad idea, but it originated in Mavericks. If you look at all the bad reviews about Yosemite on the App Store a lot of them are complaining that the download stops and then waits for hours to resume. One review even said it only resumed when he clicked on the App Store and made it active again. Most people don't know what this is and what it does, and it just leaves them confused why their system is "locking up." What Apple should do is launch a dialog before entering App Nap and tell the user it's about to do this and give them an option to disable it right then and there, but no such warning exists (at least I haven't seen one).