I'm sure that this will be controversial:
I have noticed that I seem to have the most energy/aggression (I feel the most like I am 'on gear') when I am either adding or removing/reducing a compound from my cycle.
There was a period where I reduced my tren dose to nearly half for about 2 weeks and I was feeling and performing even better it seemed as a result of that change.
I also noticed before that I felt really 'on' when I had stopped all compounds and was just entering PCT.
My theory is that I have the most aggression when I am in a changing hormonal state, and that any constant state becomes 'stale'.
Therefore EOD pinning is subject to slightly more level fluctuation and is beneficial.
(Disagree if you want.)