i am amused by the pro-mileage folks trying to knock her by comparing her to the training partner cycling a ton. "see, you need to do distance." right, we want to be the training partner and not the medalist. and you're missing the point of them wanting to stay off their feet. it's not that they are lazy. it's they do non-ground-pound endurance work, for the benefit of their legs. trying to spin that back into pro-mileage misses the point.
as someone who while generally a sprinter/hurdler but did some XC but didn't compete on a track above a mile, i find the broad brush training a bit goofy. no heed to who is breakable or not. and while i understand some programs vary, we toss in 8/mile folks with 5/10k?
i don't think they need the same work. i think they do the same work because (a) some schools use TF as XC prep work, and XC runs further, so they are really training for the fall under the guise of race prep for the spring and (b) it's easier to administer some big tent than a separate mid-distance group or even multiple groups or individualized training. and you set the big tent by the people who are running 8ks or 10ks and need the miles to prepare for that. i don't buy a half mile specialist needs that.
last, people are dissing her mile ability, but her WA stuff says she ran 4:30 1500 at age 15. presumably she'd be pretty quick but she's a medal threat staying put, and unlike mu who got cute and is now a "game time call," she stayed disciplined and home and is ready to go. i would assume most of these elite runners could step up or down a race and be serviceable. mclaughlin can run 110s in the 12s, in addition to the better known sprint exploits. is keely boring or are the american experimentalists undisciplined? i would say in my new sport i'd rest a week or two and then play around in other events for a few weeks before returning a month or two later. to me the ideal time to tinker would be the post-summer meets, after olympics or worlds, you're still fit, you're not pulling a muscle from lack of fitness trying new stuff, and DL Final or not, the Serious Event is over, it's playtime. and if god forbid you do tweak something, you have a whole offseason to rest it off, and your big picture goals are done.