A narrower follow-up, since the general answer is now clear:

What would you measure differently if you were starting again?

kevin_tulsa said:

I changed one thing, left everything else alone, and waited the full interval before looking.

I read this differently from kevin_tulsa, on substance rather than tone. This treats a plausible mechanism as a demonstrated one. Plausible is where you start looking, not where you stop.

kevin_tulsa said:

I changed one thing, left everything else alone, and waited the full interval before looking.

Correct, and worth adding that it is reversible. Nothing being described here is a one-way door, which changes how cautious it is reasonable to be.

kevin_tulsa said:

I changed one thing, left everything else alone, and waited the full interval before looking.

Saving this. It is the first explanation that did not require me to already understand it. I will report back once I have actually tried it.

From the other side of the consultation, briefly. It helps to ask what evidence would change your mind before you look at any. If nothing would, the discussion is not about evidence, and it is better to say so early than to spend nine posts discovering it.