My point is that, from the perspective of email, you frequently receive internal feedback that doesn't correspond to how users actually use email. For example,

My point is that, from the perspective of email, you frequently receive internal feedback that doesn't correspond to how users actually use email. For example, if the org uses desktop Outlook but < 1% of your audience does, is it worth optimising the email for that audience based on internal feedback? If someone notices that something weird happens when an email is replied to or forwarded, is that something worth acting on based on the real world frequency of that action?