In a lot of cases, time and value. My brother has a squat of 500 and some change, and a 405 DL, but it's not worth it to him to improve those much further. He's foremost a football player and second a wrestler, and lifting is a means to those ends. He could likely hit an 800 DL if he focused on it, and heck, I might even be able to bump my shoddy 315x5 to 800 if I really worked at it, but that's flat out not an option for any woman.
The main reason I get so annoyed by this argument that "women can do basically anything a man does, if they weren't held back by socialization etc" is because I used to be a huge proponent of it, myself. Engaging in almost any type of sport or competitive activity quickly dispels you of that notion. While a female comp black belt could delete me from the face of the earth, I'd be very surprised if there's a female black belt alive who could beat even the best black belt in Columbus Ohio, and it's not like Cbus is a jiu jitsu mecca. We split sports by sex for a lot of reasons.
https://www.mca-marines.org/gazette/blog/2012/07/05/get-over...
https://www.mca-marines.org/gazette/2014/09/why-women-do-not...
http://www.theamericanconservative.com/articles/why-special-...
1. Progressive and liberal-minded individuals think that promoting the idea that there is no functional difference between men and women will help fight gender inequality but this is not only untrue, it is dangerous. See the linked articles in my comment; people absolutely are debating this, these people are driving real policy changes, and you misrepresent them saying they are not.
2. Part of this agenda is shaming people for treating men and women differently, like in the OP. In this case they're right to do this, it's not productive or fair to write science articles about women differently than ones about men. But in other ways there is definitely a culture being created where it is taboo to treat men and women differently in any capacity and maybe that's not entirely a good idea. That's why it 'matters'.
Also, please avoid name-calling like "intentionally dense", even when you're not attacking someone specific. It lowers discussion quality and points the vector downward for others.
Will a man hold the deadlift record? Most assuredly. Does this in any way matter? It sure doesn't seem like it does.