I hope you rated it, “So fecking easy I kept on typing” 
It was way harder than I thought it would be.
I usually text on my recovery’s to take my mind off the work. I’m still doing the final endurance interval at 60% and my heart rate is at 80% of max
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They are fun… 
My own experience is short intervals are easier on my muscles then are sustained intervals.
I agree. I dont think my HR is as elevated as long on short shorts though. My breathing is also not as labored on the short shorts
Yes, long intervals are more more painful for the legs.
But i’m not speaking about difficulty, I’m speaking about gain/improving your fatigue resistance at that power/repeatability at that power.
And specifically about 30/30, not maxed, vs 30/15 that would much more cardiovascular.
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I will be adding those 30/30 closer to the event. They Def have a place in training.
I might do 30-30 on Friday just to see the difference
I get your point but maybe the issue is I am not comparing apples to apples. I find the short stuff easier on the legs but the TR short versions are lower PLs. So Gendarme +4 is two 20 minute blocks of 30/20 but it definitely feels easier on my muscles then doing two sets of 3x3. My legs are struggling at the end. This is though a PL of 5.9 to 8.0 or so.
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Yea, thats where the zone labeling leads to confusion with all of this. a vo2 max interval is only a vo2 max interval if you achieved near or close to vo2 max. Its not an arbitrary power level. I agree with your assessment that it has other reasons
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