Six things on a serious note:
1. You're right—there should be more folks focusing on this. I think it is changing, but it often seems the change is happening far too slowly. Still, this is better than where it used to be.
2. TLDR; don't underestimate how difficult it is to help the ED sufferer recognize the issue and treat it. On a "support team" side, there are truly a number of factors in play. Even if someone is knowledgeable about the signs, and can see the issues, often the ED sufferer is in denial, or outright obstinance, about it being a problem. Some will even recognize it is a problem, but are willing to exchange what they think are short-term gains for long term risks. Moreover, well-meaning folks trying to help often approach it poorly (every ED sufferer is different, and how to reach them differs) and even those who do not often get pushed away by the athlete if they persist. Watching friends and loved ones suffering from addictions or disorders is truly difficult, and hard to navigate for more than just the sufferer.
3. Focus on body weight is terrible. Weight is a poor substitute for a myriad of relevant factors—it summarizes a bunch of different things down into one number, and using that number as a gage is foolish. BMI has the same issues. To a degree, even VO2Max measurements have the same problem—it is a summary of factors, and not what you should be focusing on (velocity at VO2Max, that's different).
4. For endurance, the high carb revolution is coming. Balancing macro nutrients and micro nutrients is coming. Elite endurance athletes already do this. The Peleton in a major cycling race? They fuel sooooo much. Major marathoners, swimmers, skiers, triathletes, etc—all have been trending towards more and better fueling, and taking down records more and more often. It's just got to trickle down.
5. High school, and to some extent college, is the bottom of the spear. They lag, badly. Many high school coaches—who often don't have much training—are stuck 10-20 years back in time on what worked then. Under-fueling—especially dangerous for high school girls going through puberty, but also for the boys—was more common. Plus, high school schedules and stresses can make it genuinely difficult to get the fuel you need. I'm not sure who—USATF, state entities, USOPC, someone?—can bring a focus to this, and maybe help educate or even mandate more focus on fueling, but that might help a lot of folks.
6. Finally, you do see more body types in both the men and women's side of things than you used to see. Does this mean fueling is no longer an issue? No. But, look back at World Champs and US Trials one to two decades ago, and compare it to now. The folks at the front vary more greatly, and each have their strengths and weaknesses, than they used to vary IMHO. This is because every runner is different, and every body has a different peak shape and form for different types of efforts. Trying to make everything the same was always foolish, but then again if you're having to balance a team of dozens or hundreds I guess there is a reversion to a mean rather than the exceptionalism of the individual.