and in my mind that rabbit hole starts with the inability for most folks to measure an increase in “aerobic base.” It certainly doesn’t begin and end with aerobic decoupling. In any case, aerobic fitness is real and perhaps doing a lot of zone2 work is asking too much (too big a leap in faith) if your only measure of improvement is FTP.
For those of us without a lot of endurance training experience (5 years here), I’ve seen some pretty big gains in FTP by investing in z2. And counterintuitively big gains in 1-5 min power. And thats comparing to TR’s SSB.