Comment by wpietri

Sure, but wouldn't that take longer to get us our answer, and therefore keep us from moving on to the next experiment sooner?

Of course, the real answer to why not is "we have an A/B system and I'm not going to add bandit stuff for no benefit". But even if I were doing it from scratch, it seems more complex. The benefit of these approaches seems to be that one no longer has to think. We want to think.