Only if you believe that trans-girls are inherently physically inferior to their cis AMAB counterparts. That seems like a very prejudiced position.
It amounts to trans people participating in sports at the level their ability permits, as meritocracy dictates. If they're good enough, they will participate. The trans-girl from
@kjironman1's post would still have been the second-fastest 200m runner at her school competing in the open division.
To clarify--my position would be that trans-boys who have not undergone any hormonal transition treatments should still be able to compete in the AFAB division if they so desire; it would only be those who have begun taking testosterone (such as the
Texas state champion trans wrestler from 2018) who would be restricted to the open division (as he in fact wanted).
This solution is clear, consistent, and the most physiological fair way to protect girls sports and give
everyone the opportunity to compete.