The practical difference in the Bayesian approach to A/B Testing is that you can start looking at your test results on day one, maybe even after the first hour, just by reading the probability of whether A and B is better than the other. Doing so does not affect the false discovery rate, which is automatically controlled by Bayesian techniques.
That’s not to say only the Bayesian questions matter; Qubit also guarantees the frequentist properties of its Bayesian A/B tests.