Yes and no.
After you have been diving long enough to get a good deal of experience, you get to know just how much milage you can get out of a given spg reading at a given depth with due regard to statey and deco stops. Alternatively you will be doing dive plans based on your depth and sac rate along with rule of thirds air management and the air integration features of a computer will not be used.
But for a novice diver, the sort of immediate feedback that air integration gives you can accellerate the experiential learning process of understanding and developing feel for your air consumption at various depths.
In many cases too, air integrated computers will show you air time remaining or no deco time remaining which ever is less. So if your air consumption is low, you will hardly ever see an air time remaining number unless you are in deco mode.
On the plus side, air integrated computers tend to be shorter and lower profile than a traditional 2 or 3 gauge console with a computer in it.
