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You're correct, it only looks at the first exposure date when calculating conversion windows. I think that's the right default behavior, but I could see some value in being able to change it. Attribution is hard and there's no perfect answer. Imagine you have an experiment on a pricing page. The user lands there, gets put into an experiment, but doesn't convert. Then a few days later they click a promo in an email, go to the pricing page (sees the experiment again), and does convert. Should the A/B test get credit for the conversion or the promo email?

Yes, you are correct. While my approach can definitely work and give results in a shorter time, it adds complexity that can results in lots more things going wrong, so yeah, can totally relate. Sometimes simpler is better.