I don’t follow NBA but I do casually watch some hockey (including women’s hockey) and I’d be surprised if even the very best women’s hockey players could beat a team made up of lower ranked NHL players. The men will have better puck handling, higher speed, more weight, and they shoot more often opening up more plays.

My anecdotal sports experience, for what that’s worth: when I was 14-15 playing soccer, women’s university teams would play against us for training. The women were taller than us on average, ran a bit faster, used more vocal communication, and were much more physically aggressive. The men had better endurance, ball-handling, and positioning. We never lost, and no one seemed surprised by this.

It’s not just the obvious height and weight advantages at play, and I’m not sure how much socialization matters but I’d wager less than our biology in sports and other extreme athletic endeavours.

Britney Griner is probably on par with a second-stringer in the NBA. She’s one of the few that there were mutterings she might be the first woman in the NBA, but instead she set a single game record and tied a career record in her first game in the WNBA.

The Williams sisters in tennis used to claim they could beat any man outside the top 200 when they were near the top of women’s tennis, so they were challenged by the 203rd ranked male player and just destroyed. He claimed at one point that he was playing closer to someone ranked 500th to keep the game fun. They later amended their claim to being able to beat any man outside the top 350.

I think I’ve already pretty thoroughly answered the question of why women haven’t played baseball at the major league level since Toni Stone, Mamie Johnson, and Connie Morgan played in the Negro Leagues in the early 50s; women have been systematically shut out of baseball for decades, and while those barriers are slowly being torn down, their effects will continue to be felt for a long time. We’re only just now beginning to see women play at the collegiate and minor league level, so I would imagine we’re still a few decades away from women playing at the Major League level.

The NBA and NFL are entirely different stories. Those are sports where brute strength is absolutely required and being huge helps a lot. It’s definitely not some fear of discrimination that’s keeping women out of those sports though.

Edit: Because I’ve seen your other responses, and I can tell you’ve been waiting for me to say something about how men are stronger than women so you can have your gotcha moment, I’ll also say that trans women are women, not men. That male testosterone advantage doesn’t exist for someone who has to suppress theirs for at least a year before competing to a level below what many cis women naturally have. Trans women have competed alongside cis women for decades and it’s never been a problem. Republicans just needed a new boogie man.