Thanks for welcoming me
Yes I agree with the " Sherlock has a bad habit of getting stuck on a particular hypothesis, and will do his best to stick with it even if evidence starts pointing in a different direction."
I must say it sort of disappointed me , in the sense that it is the proper of highly intelligent people in every field ( like science for example )to contemplate a priori all kinds of hypotheses , including the exotic ones , compared to more mundane minds which are proner to dwelve into one theory . And then maybe correct it when facing other elements . I guess that it is more related to a storytelling constraints than failing to grasp Sherlock personality , since the whole hypotheses disply is very well used when Sherlock locally uses his talents to uncover a person 's personality or intentions, because he can explains it very succintly to the world by the bias of interaction with Watson for example .
I did not know there was a shorter version of " A study in pink " , that makes sense now, but to me it looked it should have been introduced in a less obvious plot twist than " a taxi is here " and "the luggage is here " . I agree also with your explanation of the poison plot, but that hypothesis raises a lot of questions about its realizability , and it is kind of weird that S.H. seems to be very quick to raise these kind of questions in psychology mining stuff and questioning police investigation techniques but less adamant to do it when faced with a real plot movement.
I have to rewatch to find other elements, and good, it is holidays