Just think about it like this:
We all need some strength work, some mobility work and some conditioning work, regardless of levels or goals. What forms these things take vary greatly depending on who you are, where you are and where you are going.
Mobility and movement work, or whatever you want to call it, can be many things: basic stretching, Yoga, basic "athlete" warm-ups, Agile 8, tumbling (to a certain degree) or a fusion of all these things. I assume people are jumping on McGregor's shit because he won - that's not a surprise. EVERY year, who ever wins the national championship in NCAA football - everyone wants to know their "secret". And coaches line up and visit and ask the coaches to speak.
So whoever is currently "hot", whatever they are doing becomes the "trend".
And then you take a step back and realize it's just something that has already been done or being repackaged in a certain way. Diet trends are the worst with this. Training is a close second.
The problem people have is ignoring they need SOMETHING of each of the 3 components of training. How many distance runners don't lift? How many PL's don't do mobility work and aerobic work? How many Yoga People don't strength train and do conditioning work? You can see where I"m going.
The older one gets, the more recovery you need. it's not hard to figure this out - you aren't the same person you were when you were 18 - and your body is worn down, especially for the Lifers out there. My wife calls the shit I do, "unfunctional training" - because I'm doing a lot of movements that I wouldn't do if I was training.
Understand that you don't need to spend an hour on this stuff. 15-20 minutes/day will suffice. Sometimes more and sometimes less. BALANCE does not mean equal time.
Once you've been around a bit, you see this shit come and go at an alarming rate. Do some squats, pulls, presses, stretch and get the lungs working - you'll be good to go.