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The three questions your developer asked you are actually a fantastic checklist for your next tracking plan, and if you add them to your template you will catch most of the holes before you ever hand it off. First, always verify whether the same button or UI element appears in multiple contexts, such as both on a product page and inside a quick-view modal, because those will need different trigger conditions even if the button label is identical. Second, check how the site handles navigation, and if it uses hash routes or the History API for client-side transitions, you will need custom event triggers for page views rather than relying on URL changes. Third, for any form, track both the submission attempt and the successful submission separately, because a validation failure still represents user effort and intent, and if you only track successes you will significantly undercount how many people tried to complete the action and failed. Add those three sections to your planning template and you will save yourself and your developer a lot of back and forth.
