Ave: The thing is, it goes both ways. Absence of evidence is not evidence of absence, but of course, absence of evidence is not evidence of presence.
Personally, I think it's important to know that some people, for some reason, be they right or wrong in their testimonies, experienced foot shrinkage, and that it's possible that it could happen to you. Because if they don't know about that or disbelieve it, people could do like my girlfriend and buy shoes in advance, only to feel frustration later because they don't fit anymore.
So I believe it's important to know all of the most commonly alledged effects from HRT and take them into consideration. Of course, it must be clear in people's head what are alledged effects and what are proven effects: it's normal to totally expect breast growth, but foot shrinkage, you shouldn't bet on that, for example.
If we were gonna include shrinking on an official list of effects from HRT, then yes, we'd need proof. But we're just saying it's not impossible, and you can't disprove that with doubts.
Doubting that it can happen and doubting that it cannot happen... none of those is a doubt superior to the other. In other words, no "side" can prove the other wrong. After all, we're talking opinions and anecdotal evidence.
In a way, it's like saying that there cannot be extra-terrestrials if we haven't seen them, or that there must be extra-terrestrials because there is no proof that they can't exist. No side can be right.
In short, we should stop fighting because none of us can be right. People should just see and make their opinion about it, because there's hardly a better course of action.