I read 1-star reviews before building. This time, it killed my Shopify app idea. A developer analyzed 1-star reviews of Shopify returns apps before building a new product, leading to a kill decision. The research revealed that the category's pain points are tied to heavy operational work, making it unsuitable for a small team. The developer questions whether pre-build complaint review is a useful founder step or basic homework. I was considering a small Shopify returns/exchange idea. Before sketching features, I did a deliberately boring check: The result was not a better feature list. It was a kill decision: I would not start by building another full returns platform. The category has real pain, but the complaints that looked promising were attached to heavy operational work: A small team could enter the category thinking it is building software, then quickly get pulled into merchant-specific operations. The narrower angles looked more believable: The part I am still unsure about: Is this kind of pre-build complaint review a useful step for founders, or is it just basic homework everyone should do themselves? Questions: I am intentionally not linking a product page here. I am trying to test the decision value of the research step first. Disclosure: This post was drafted with AI assistance and reviewed by the author before publishing.