Well, my thinking is that if you let most of the nail grow out before you have the acrylic fill done, your own nail gets much more chance to breathe than it would if you had the acrylic filled every week or 10 days.
I will admit I've been using this technique only for a couple of months, but my acrylic coated nails do not appear to be in much danger of having the acrylic part separate from the natural nail. (As I said, when the nail grows out about 1/8 inch, I cross file the nail with an emery board to smooth the edge between the acrylic and the natural nail. Then, when there's no sharp edge any more, I apply a coat or two of a clear "nail hardener.".)
If I find that my acrylic coats start to pull away, I'll let you folks know. But do you not think that waiting a little longer between fills would keep your natural nail healthier by virtue of letting more of its surface breathe for a while?