I did 4 months of high volume Z2/low HR followed by 4 months of inactivity. So… 
What I’m thinking is that the TR plans, even though they get me to the same place, are much more work than I actually require. Or more precisely, they are much more work of (perhaps) the wrong kind. I identify with many of Couzens’ ‘quick responder’ descriptors even though my natural fitness might be average, so I might benefit from more of a polarized model (I did feel great with all that Z2).
Structure of work and rest is another important point and one I might not be able to avoid once return to work happens. Currently I’m able to do whatever combo I want, once I’m bound by the work week I’ll have to submit to a different strategy which might not be as effective.
To conclude – I’m happy I followed the collective vote and did the ramp test. 