While the rules have been tweaked a couple of times since I began playing disc golf in 1995, two general things about the rules have remained the same. Enforcement of many of the rules depend on an often used phrase in the Rules of Disc Golf;
". . . if observed by two or more players of the group or an official."
First, the whole idea of enforcing a rule IF it is observed to have broken has been a sketchy proposal for my entire time playing. There are lots of reasons for fewer than two players or fewer than one official to observe a blatant rules violation. With the players it tends to be a matter of paying attention. With the officials, it is that there are rarely officials on a course. The players are socializing, too. Calling violations is risky, especially if the other players know each other but not you. Maybe they all have "Shultz Syndrome" (Hogans Heros).
The number one, top reason that something like "if" can make any sense (in the context already mentioned) is that there is no rule that requires all of the players within the group to observe the away player's shot. If there were such a rule, "if" could be "when" and nobody would have to feel badly about trying adhere to the same set of rules as everyone else.
I'm interested to see what folks think about that.