HRT without testosterone blocker

Hi everyone. I'm MTF and I'm about to start HRT. Today I went to check the results of the exams and, as everything was ok, the doctor prescribed the hormones. Yey :)

However, she asked me about my sex life and my marriage. And then decided to prescribe just 2 mg estradiol valerate, with no testosterone blocker. According to her, this way I won't have problems with erections etc, but she says I should get the same expected results from the estradiol (except for the hair growing reduction).

I think that what she is saying it's bullshit and that without the blocker, the estradiol effects won't happen. Have anyone here ever seen this kind of prescription? Or can anybody elaborate why ot should (or shouldn't) work as she says?