The IOC have recommended that a MTF athlete:
Quotemust demonstrate that her total testosterone level in serum has been below 10 nmol/L for at least 12 months prior to her first competition (with the requirement for any longer period to be based on a confidential case-by-case evaluation, considering whether or not 12 months is a sufficient length of time to minimize any advantage in women's competition)
Presumably the body responsible for each sport would take this requirement seriously on a case by case basis so as to avoid physical advantages over cisfemale competitors. If that body has neglected to do so, it seems unfair to criticise an individual athlete or indeed all trans athletes for the possible failure of the 'system'
In drug testing, a MTF athlete caught with a testosterone level above 10 nmol/L would no longer be able to compete in the female category. As such tests are random and not just confined to competition, one can't simply choose when or not to use blockers to gain some sort of advantage. Doing so would be akin to doping
It also seems to me that in most sports there is much more to success in competition than just the physical prowess of the athlete. From my experience psychology is as important if not more so than sheer strength in gaining those podium positions
What I have noticed personally since starting HRT is that my aggressive, competitive nature has all but gone and it is highly unlikely it will ever get back to the same level as I had last year. Without this, I doubt I'll ever have an advantage over other female cyclists
This seems to be reflected in the comments I have heard from elite and professional MTF athletes. More so, there are plenty of MTF athletes across many sporting disciplines and I have yet to hear of one dominating her field in any way