YANBU. I completely agree that transwomen should not be able to compete in women's sport. It is obvious that males have a huge advantage over women in physical strength, and body development etc that is not reduced after transition. I feel for a TIM who would be ruled out of women's sport by their transition, but it is not dissimilar for people with some disabilties who don't have an appropriate category to compete in. Or people in pain, who people with poor co-ordination. It is something we just have to learn to live with and find another outlet.
There can surely be no real sense of achievement in beating women who have no actual chance of beating you. It is not sporting at all and certainly not in the spirit of the Olympics.
However, I do find some of your wording strange though OP, you don't sound as though you respect women's sport. The effort/ difficulty is the same but it is more like the difference between racing greyhounds vs whippets, rather than greyhounds vs amoeba.
And I must just add for accuracy; equestrian sports do not take strength - for throwing around haybales yes. For handling the horse you ride? No, that's not how it is meant to be done. So Barbaro if you are using so much strength to stay on your horse, then sadly you really are doing it wrong! It takes fitness, suppleness, balance, dexterity, control over your own body and 'feel', but absolutely not strength. That is why men and women can compete on equal terms.
Yes, F1 does take a lot of strength. The G forces are huge. Racing drivers have become so small and light these days that most male drivers would be excluded for being to tall and heavy. David Coulthard has talked about the pressure on him to be thin and light so he could meet the weight restrictions, similar to the pressures that jockeys face. Mark Webber was also incredibly lean. So from this perspective I think it could just about be possible for an exceptional woman to succeed, but the barriers to entry are so great eg finance and sponsorship. Thankfully we have already had female F1 drivers and female F1 race winner so that honour cannot be hijacked claimed by a transwoman.
And surely the original intention was for women's sport to be segregated for biological sex not gender. It is clearly wrong for men to push women out of sports (and rights and places) that women have fought for.