I hate to keep bringing things back to the fact NFHS football is played by High School kids, but there are times when exact precision can cause more trouble than it was ever intended to avoid. As long as the "25 second" count is in the hands of a competent field official, and moves at a constant pace (for both sides) games seem to progress smoothly, despite the fact the actual pace may not always be exactly 25 seconds.
Keeping that time interval on the fiels, CLEARLY isn't broken, and there doesn't seem to be any glaring need to fix it, especially if the fixing is entirely for fixing sake.