I know it's unintentional but even that first sentence – giving some lenience to the concern around matters like sports – is a tad frustrating. There are mandatory periods of time post-transitioning before trans women can compete. As has been mentioned trans women have been allowed to compete in the olympics for over 15 years and have never won a medal. I'll repeat again the quotes from medical professionals in the case of Fallon Fox; an MMA fighter that drew controversy when she won (it was fine when she lost) since it's in relation to the type of sport you reference:
If you have even a passing interest in the day-to-day happenings in mixed martial arts, you have no doubt heard about Fallon Fox , MMA ’s first transgender athlete. The story has been discussed ad nauseam over the past ten days or so...
bleacherreport.com
Bloody Elbow has been a leading voice in combat sports since formation in 2007 and has earned a global reputation for expert analysis, opinion and news.
www.bloodyelbow.com
This isn't some topic that's not being broached for convenience around trans athletes, it's one that's been considered. Like bathroom access and all the other points the framing from Gender Critical adherents is around positioning this as some newfound issue that has to be discussed before things occur. Instead of them having been discussed and them having occured without issue up until now.
Worth noting as well that guidelines are also not ones that solely affect trans women. There are cisgender women who have also been barred from competing unless they take drugs to suppress their own testosterone levels, because they count as being too high to compete in female sports.