I understand your point, but still disagree…if riding at 80% FTP gets you a 3’30" bike split, it should be obvious this is not a realistic goal. There are plenty of tools out there for athletes to get a reasonable expectation of their time based on their power history. Best Bike Split being the most obvious, but even Triathlon Time Calculators are a huge benefit.
If a 3’30" split is a target result, then odds are pretty high that the athlete knows the bike is not their strength and will not be out there riding at .8 IF.