Well, it's good news for me that you guys have phones that can go to sleep on your home WiFi connections and still receive instant push. Some people say 'Why does a 5 or 10 minutes delay matter to you anyway' but in my case I communicate with my clients using email as a sort of text message system (mainly because it's automatically archived in a way we're both familiar with) and people expect me to be responding within seconds.
I don't even need email to come into a sleeping phone. 99% of the time the phone will be awake. I just need it to be able to go to sleep then wake up and receive mail.
Another issue is this. I can't set it to never go to sleep because battery life isn't quite what I've come to expect (is it even possible to set the Nexus 4 to never go to sleep?). I have become used to going a day without having to charge.