That wasn't what I was addressing, so we're still talking about two different things. I suspect the OP had some real considerations and wanted some enlightenment on his issue.

Well, let's get back to the OP's question: "What is the advantage of a threadless headset vs a threaded?". That's all I listed in straight facts and that was my only intent with my original reply. Somewhere along the line, people debated why some attributes are better or worse than others, which is one step away from the actual facts themselves because it involves personal subjective judgement. For example, I doubt a stem ever thinks it is or isn't "silly".

You have some quick conclusions and assume it's hard concrete reality when it really isn't. I've talked with several manufacturers in the design stages of their stem development, I can assure you that there's at least 15 factors involved, many of them conflicting with each other. It's not as simple as narrowing it down to a single factor in why they go with a certain design.

No I don't, if you read my posts, I have never said anywhere where one's "better" than the other, just that they have different characteristics. I'm offended more by your assertion that my data of stems flexing is "silly" when you haven't done any testing yourself to confirm the actual imperical data. And after having worked in a shop for 10-years, I've come to realize that there's no such thing as all-or-nothing, black&white, yes/no qualitative solutions, it's all shades of grey. There's a wide range of attributes to all components and there's no one "right" answer for everyone. That's why I only listed characteristics of threaded vs. threadless and made no comment on why one should or shouldn't use one or the other; it's up to each person to decide for themselves based upon what they want out of their bike.

Really, some people want garage-queens that they never ride, that's fine. Some people want an 8lb bike to hang on their wall as art, that's OK too. I'm not going to make any assumptions on what the intended usage is and the OP never asked for recommendations.

To some people that's important. For control-purposes, especially when getting smashed on both sides in a sprint, I think it's important. For not snapping a stem in a sprint, that's important. The differences in failure rates are significant. If these events never occur in your riding, then it's no big deal to you. For others, height-adjustability and clean styling is important.

You can review all of my posts I've ever made here, I'll typically only talk about bikes and parts and methodology, and we can debate that endlessly which is kinda fun, but I make it a rule to never judge another person's post, or critique their writing or pass judgement on their character. But for you to judge other people's choices and consider their real-world experiences as "silly", that's beyond arrogant and is downright rude and insulting. It's fine to be a certain way but to say that others can't be the way they are, that's stepping over the line.