This may be getting into technical minutia, but it's something that's been bugging me since I first came across it.
I've seen multiple different views (as one might expect) for the position of the grounded foot for performing back-leg front kicks (striking with the ball of the foot). In the first variation (the one I am most familiar with) the grounded foot stays planted, pivoting to the side for increased reach if needed. I've seen several sources that use this pattern.
I've also come across several other sources that clearly show that the kicker rises up on the ball of their foot for this kick. Sometimes this is rather extreme, going way up onto the ball of the foot. Tedeschi (in Hapkido) talks about how this gives "increased reach," but nothing else really seems to be said on it.
Most sources I've seen just seem to pick one strategy or the other.
I recognize that there are inherent stylistic differences in how different schools approach the same move. In this case, I'm curious if anyone is aware of any inherent advantages or disadvantages to one over the other as a means of increasing reach, if it derives from different in approach to how/when that kick gets used, or if it is mostly just a matter of style?