I think we can all agree on two things:
1) The focus and purpose of PCT is the recovery of hormonal homeostasis in as efficient manner as possible
2) We are prepared to take compounds/products to further facillitate (1)
Now, my thinking (in part) is this: if there is any product we would choose to avoid during PCT due to its potential to inhibit (1) in some capacity, if we do run that product on-cycle then we should utilise a SERM for PCT. So, that would include even mild cycles that use compounds like 11kt for example.
To put another way: many folk say a SERM is overkill for a mild cycle like 6 weeks of 11kt. Id say, if you wouldnt run 11kt during PCT due to concerns it may stifle recovery....use a SERM as your PCT when you do run it.