I've only coached one NCAA championship-winning XC team and a couple of others that finished on the podium, so I get that I don't have enough experience and understanding to credibly post on the mighty Letsrun message boards. Having said that, there is one study that found that adding running drills to an interval running training program for (recreational) runners was ineffective for improving performance.
https://journals.lww.com/nsca-jscr/pages/articleviewer.aspx?year=2015&issue=07000&article=00005&type=Fulltext
You could argue that drills would somehow be more helpful for well-trained runners, but that isn't logical since you would expect well-trained runners to already have better technique and less room for improvement in the first place.
If you want to look for it, there is much stronger research evidence to support inspiratory muscle training, barefoot running, warming up with a weighted vest, and/or even controlled-breath swimming to improve running economy and performance, all of which are things that don't necessarily take up more time than drills, but which very few runners utilize. Fwiw, I have found much success with my runners using many of these techniques, and that success has been despite never having my runners do drills. Also fwiw, there is some research on the use of drills with other (non-running) exercise that found that there is an interference effect, which is what makes the drills ineffective.
While I agree with Art that running is most definitely a skill, like most skills, the absolute best way to improve it is to correctly repeat it as much as possible (i.e. run more mileage) which also has a tremendous amount of support for improving running economy, fitness, and performance in the research literature.