I think my response and issue to this is:
I make videos and write articles and everything else to educate people. To give them options. And in every one of those videos, you pointed out, I try to do just that.
So it's not a contradiction. It's that there is no single way to train that fits everyone. Even at the elite level. Go compare how Hocker and Nuguse train....it's very very different. Despite both having similar 800/1500/5k abilities.
Even the quote you use... the point is...most people should "train, not strain." Leave one rep in the tank. We can argue whether it's one or two or three. That's fine. I'd argue, as I have in that video and in writings, that it depends on the situation and the program. If you do 2 intervals a week, it's closer to 1 rep. If it's 3 workouts, then some of those are going to be moderate (Go read my article I wrote for Runners World 15 years ago on: it's not just hard/easy, the value of the in-between days). But most of the "X factor" workouts people do, aren't leaving a rep in the tank. They are going to the well. They are struggling to hang on. THey are not fast and smooth. So repeatedly emphasizing that is very important to folks.
So to counter:
It's why I had a video on all aerobic intervals, and did a massive course on Igloi training, and a decade ago showed how I trained a HS kid to a state championship after mono on all "easy" intervals and easy running.
All of that falls in line with: lots of moderate frequency.
But at the same time, I also do videos on traditional 2 workouts and a long run, where the individual workouts often need to be harder. Why? Because this is the setup for the vast majority of HS and college coaches/runners, which make up a large part of the audience. So, they need to understand how to manipulate variables and so forth given that system and constraints.
So there, leaving one rep in the tank is much more important for most workouts than doing lots of moderate workouts, because it doesn't fit in that program.
And it's why I spent several articles and videos outlining how I coached an elite marathoner top 6th at worlds as a full time nurse and mom...which meant we had to back to back hard workout/long run on the weekend to get in training often...because we couldn't fit many hard workouts into the middle of the week when she was working.
And on and on. So my problem with folks is you can cherry pick any video or article and say, well "Steve said do back to back long workout and long run in the weekend, that will kill somebody!" But as I try to point out over and over again...training is all contextual.
It's not fit an athlete into your training program. It's create a program out of Athlete characteristics/constraints. + Event demands.
So what I try to do in every video, article, etc. for the last literally 20 years is teach people the tools. How and when to utilize them, what their downfalls are, what to watch out for, etc.
So you might think "save one rep in the tank" is poor advice. But the reality for a LOT of HS and college coaches out there, it's the exact advice they need! Because what so often happens in teams settings is that last rep becomes a race.
You, on this message board, might need other advice. That's fine.
But I'm never going to be everything for everyone, and if I tried, I'd end up being a formula, paint by numbers type guy. And that's not who I am as a coach. And I think too often when it comes to podcasts, youtube videos, tweets....to many folks reads them as: This is directly applying to me. And it's often not. And that's okay.
I think what I find frustrating with some in this group (definitely not a majority) is that coaching is about exploration. It's about figuring out what works for the individual. And it does come across as some folks believe they've found the holy grail. And that's great for yourself. Keep on doing it.
But everyone is different. And for every person you say "Look they ran a 15min 5k or a 2:25 marathon" off NS...I can point to many guys who did the same off Lydiard, Daniels, Easy Interval Method, the PAAVO method, and on and on.
I mean look at HS teams. Some of the most consistent HS teams in the country use PAAVO training which is basically racing your "tempos" going well past LT every single week for months... Yet they succeed, and remain pretty injury free...
It's basically the antithesis of NS...but it works and for a long time... And I'm not a big fan of it...but it works. So we can't just dismiss it entirely.
That doesn't mean that some of those programs are better or worse on average. But what it teaches you as a coach is you've got to have a lot of different tools in the toolbag. Because some day you're going to need to go in the completely different direction than you normally would because of Jack or Jill sitting across from you.
And my goal in educating coaches is to teach them as many tools as they can. Sometimes that means a very deep dive, other times its surface level and simplifying. Someimtes that means content for elite and sub-elite coaches and athletes, sometimes that means content for beginners.