You have no problem accepting eg a treatment can only work on a man, but not on a woman. But modern medicine have no concept of a yin body type and a yang body type, which may or may not be male and female.
The whole idea of TCM is balance, and it varies with the individual, unlike modern medicine, where there is a right and wrong answer to everything. Bacteria bad, antibiotic good. Fever bad, paracetamol good.
Take fecal transplants for example. I dont think it is well understood how it works or it will be a pill by now, and is a last resort when all else fails. And it doesnt involve killing all the bacteria, but restoring balance to the bacterial ecosystem.