The impetus behind this rule has NOTHING to do with being able to go fast on the front end. It's all about consistency on the back end. That does involve better consistency on the front end for crews that took their time to allow the offense to call their play or were just slow.
I've really tried to see the benefit of what, thus far, sounds like a lot of misdirected effort to fix something, that may not have been perfect, but wasn't broken. Granted some (perhaps many) of us have slipped into bad habits allowing time to slip by during the proper management of the game, affecting some sense of consistency of pace.
The reality (and elephant in the room) is still NFHS is dealing with teenagers, and below, rather than young adults and/or seasoned professional athletes and there is an actual difference in attention span, maturity and experience that often creates both subtle and non-subtle differences. Thus far, as more ancillary issues continue to surface, the realities of officiating crew size, playing field accouterments and facilities as well as the consistency and/or maturity of mostly volunteer, but necessary, support personnel (chain crews, ball boys, etc.) seem to be generating more concern than originally anticipated, or since provided for, exacerbating the inherent difficulty and danger of presuming "One size can fit all".
Identifying specific causes of general "time wasting habits" and establishing specific on-field game management corrective mechanics may prove to be a more effective and consistent adjustment process, better and more universally applicable to the wide variety of NFHS venues and circumstances.