One of the ways I astound my Sacramento clients and provide superior service is to respond immediately to emails. That is easier to do when you receive emails in a more timely manner, too. Our phones have helped a lot with that. Especially when we're out in the field. However, try reading a long email on your phone; it is very difficult.
Now, try to do it on an Apple Watch. Some emails won't even appear on an Apple Watch.
The other difficulty with reading email on your phone is sometimes you can miss the CC participants, so you might not respond to all. Although, the way around that is to simply always reply all.
You can read more in my personal blog today about my extreme methods of dealing with email at this link: How Often Do You Check Your Email?