I love your posts, and completely agree that Bayesian Bandits are not replacements for A&#x2F;B tests.<p>To be fair though, the realworld issues like nonstationarity and delayed feedback are also concerns for A&#x2F;B tests (which you also bring up in your great post), and you can tweak the bayesian bandits to handle these cases decently.<p>How does counting sessions instead of visitors avoid delayed feedback? I read your post [0] but dont remember anything about that. Is it just that they say that after a session is completed (which is somewhat nebulous to measure in many cases), then you have all the data you need from the visit?<p>[0] <a href="https:&#x2F;&#x2F;www.chrisstucchio.com&#x2F;blog&#x2F;2015&#x2F;no_free_samples.html" rel="nofollow">https:&#x2F;&#x2F;www.chrisstucchio.com&#x2F;blog&#x2F;2015&#x2F;no_free_samples.html</a>