We do have a question on this site that explains that the rules explanations of Jeremy Crawford, the head designer of the D&D 5th Edition rules (both for 2014 and 2024), are not considered official rules guidance anymore, while they were considered "official" before the release of the Sage Advice Compendium in 2019.
But that they are not official rules guidance anymore is not the only thing I have seen in comments that speak against using his missives to answer questions about murky rules. The tenor from these comments often was that his rulings are so inconsistent that you would do better to not consider them at all.
When I started here, I found this very surprising. For many other and smaller RPGs, you'd be delighted to get an explanation from the person that developed the game, and would treat their statements pretty much as "Word of God" on how things are supposed to work. Even if his tweets and utterances in podcasts or interviews are not official, my expectation would have been that they still should be a really strong supporting argument for how a rule was intended.
I missed the period in which his tweets and other statements were official, and therefore missed the problems they might have caused. Does anyone know of examples, and can provide a clear explanation of why he is unreliable or misleading?