Yes, many rules rely on the goal line for a specific reason which is usually obvious - e.g., obviously a touchdown is dependent on getting the ball across the goal line.
However, in this particular instance, what is the rationale for making a loose ball be a turnover because it touches the pylon vs. rolling out at the 1? It is a huge discrepancy which is largely (and sometimes entirely) out of the control of either team.
Someone mentioned above that the rule may be intended to prevent an intentional fumble. I like the effort to seek the rationale, but if that is indeed the motivation for the rule, isn't there a fairer way to reach this goal? 99% of the time when there's a fumble near the goal line there is no motivation for the offensive team to fumble. The only time in which it seems plausible that you may want to fumble is if it is 4th and goal and the offensive team is clearly not going to score. In that case, why not just say that if it's 4th down, the offensive team can't advance the ball on a fumble?
Outside of trying to prevent intentional fumbles, making it a turnover seems entirely arbitrary, but I'd love to hear other rationales as for why it makes sense to make it a turnover. It seems like an unduly harsh penalty to the offensive team.